;;; tramp-tests.el --- Tests of remote file access  -*- lexical-binding:t -*-

;; Copyright (C) 2013-2025 Free Software Foundation, Inc.

;; Author: Michael Albinus <michael.albinus@gmx.de>

;; This file is part of GNU Emacs.
;;
;; GNU Emacs is free software: you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;;
;; GNU Emacs is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Some of the tests require access to a remote host files.  Since
;; this could be problematic, a mock-up connection method "mock" is
;; used.  Emulating a remote connection, it simply calls "sh -i".
;; Tramp's file name handlers still run, so this test is sufficient
;; except for connection establishing.

;; If you want to test a real Tramp connection, set
;; $REMOTE_TEMPORARY_FILE_DIRECTORY to a suitable value in order to
;; overwrite the default value.  If you want to skip tests accessing a
;; remote host, set this environment variable to "/dev/null" or
;; whatever is appropriate on your system.

;; For slow remote connections, `tramp-test45-asynchronous-requests'
;; might be too heavy.  Setting $REMOTE_PARALLEL_PROCESSES to a proper
;; value less than 10 could help.

;; A whole test run can be performed calling the command `tramp-test-all'.

;;; Code:

(require 'cl-lib)
(require 'dired)
(require 'dired-aux)
(require 'tramp)
(require 'ert-x)
(require 'seq) ; For `seq-random-elt', autoloaded since Emacs 28.1
(require 'tar-mode)
(require 'trace)
(require 'vc)
(require 'vc-bzr)
(require 'vc-git)
(require 'vc-hg)

(declare-function tramp-check-remote-uname "tramp-sh")
(declare-function tramp-find-executable "tramp-sh")
(declare-function tramp-get-remote-chmod-h "tramp-sh")
(declare-function tramp-get-remote-path "tramp-sh")
(declare-function tramp-get-remote-perl "tramp-sh")
(declare-function tramp-get-remote-stat "tramp-sh")
(declare-function tramp-list-tramp-buffers "tramp-cmds")
(declare-function tramp-method-out-of-band-p "tramp-sh")
(declare-function tramp-smb-get-localname "tramp-smb")
(defvar ange-ftp-make-backup-files)
(defvar comp-warn-primitives)
(defvar tramp-connection-properties)
(defvar tramp-copy-size-limit)
(defvar tramp-fuse-remove-hidden-files)
(defvar tramp-fuse-unmount-on-cleanup)
(defvar tramp-inline-compress-start-size)
(defvar tramp-persistency-file-name)
(defvar tramp-remote-path)
(defvar tramp-remote-process-environment)
(defvar tramp-use-connection-share)

;; Needed for Emacs 27.
(defvar lock-file-name-transforms)
(defvar process-file-return-signal-string)
(defvar remote-file-name-inhibit-locks)
(defvar dired-copy-dereference)

;; Declared in Emacs 30.
(defvar remote-file-name-access-timeout)
(defvar remote-file-name-inhibit-delete-by-moving-to-trash)

;; `ert-resource-file' was introduced in Emacs 28.1.
(unless (macrop 'ert-resource-file)
  (eval-and-compile
    (defvar ert-resource-directory-format "%s-resources/"
      "Format for `ert-resource-directory'.")
    (defvar ert-resource-directory-trim-left-regexp ""
      "Regexp for `string-trim' (left) used by `ert-resource-directory'.")
    (defvar ert-resource-directory-trim-right-regexp
      (rx (? "-test" (? "s")) ".el")
      "Regexp for `string-trim' (right) used by `ert-resource-directory'.")

    (defmacro ert-resource-directory ()
      "Return absolute file name of the resource directory for this file.

The path to the resource directory is the \"resources\" directory
in the same directory as the test file.

If that directory doesn't exist, use the directory named like the
test file but formatted by `ert-resource-directory-format' and trimmed
using `string-trim' with arguments
`ert-resource-directory-trim-left-regexp' and
`ert-resource-directory-trim-right-regexp'.  The default values mean
that if called from a test file named \"foo-tests.el\", return
the absolute file name for \"foo-resources\"."
      `(let* ((testfile ,(or (bound-and-true-p byte-compile-current-file)
                             (and load-in-progress load-file-name)
                             buffer-file-name))
              (default-directory (file-name-directory testfile)))
	 (file-truename
	  (if (file-accessible-directory-p "resources/")
              (expand-file-name "resources/")
            (expand-file-name
             (format
	      ert-resource-directory-format
              (string-trim testfile
			   ert-resource-directory-trim-left-regexp
			   ert-resource-directory-trim-right-regexp)))))))

    (defmacro ert-resource-file (file)
      "Return file name of resource file named FILE.
A resource file is in the resource directory as per
`ert-resource-directory'."
      `(expand-file-name ,file (ert-resource-directory)))))

;; `ert-remote-temporary-file-directory' was introduced in Emacs 29.1.
;; Adapting `tramp-remote-path' happens also there.
(unless (boundp 'ert-remote-temporary-file-directory)
  (eval-and-compile
    ;; There is no default value on w32 systems, which could work out
    ;; of the box.
    (defvar ert-remote-temporary-file-directory
      (cond
       ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
       ((eq system-type 'windows-nt) null-device)
       (t (add-to-list
           'tramp-methods
           `("mock"
	     (tramp-login-program	,tramp-default-remote-shell)
	     (tramp-login-args		(("-i")))
             (tramp-direct-async	("-c"))
	     (tramp-remote-shell	,tramp-default-remote-shell)
	     (tramp-remote-shell-args	("-c"))
	     (tramp-connection-timeout	10)))
          (add-to-list
           'tramp-default-host-alist
           `("\\`mock\\'" nil ,(system-name)))
          ;; Emacs's Makefile sets $HOME to a nonexistent value.
          ;; Needed in batch mode only, therefore.
          (unless (and (null noninteractive) (file-directory-p "~/"))
            (setenv "HOME" temporary-file-directory))
          (format "/mock::%s" temporary-file-directory)))
      "Temporary directory for remote file tests.")

    ;; This should happen on hydra only.
    (when (getenv "EMACS_HYDRA_CI")
      (add-to-list 'tramp-remote-path 'tramp-own-remote-path))))

;; Beautify batch mode.
(when noninteractive
  ;; Suppress nasty messages.
  (fset #'shell-command-sentinel #'ignore)
  ;; We do not want to be interrupted.
  (fset #'tramp-action-yesno
	(lambda (_proc vec)
	  (tramp-send-string vec (concat "yes" tramp-local-end-of-line)) t))
  (eval-after-load 'tramp-gvfs
    '(fset 'tramp-gvfs-handler-askquestion
	   (lambda (_message _choices) '(t nil 0)))))

(defconst tramp-test-vec
  (and (file-remote-p ert-remote-temporary-file-directory)
       (tramp-dissect-file-name ert-remote-temporary-file-directory))
  "The used `tramp-file-name' structure.")

(setq auth-source-save-behavior nil
      password-cache-expiry nil
      remote-file-name-inhibit-cache nil
      tramp-allow-unsafe-temporary-files t
      tramp-cache-read-persistent-data t ;; For auth-sources.
      tramp-copy-size-limit nil
      tramp-error-show-message-timeout nil
      tramp-persistency-file-name nil
      tramp-verbose 0)

(defvar tramp--test-enabled-checked nil
  "Cached result of `tramp--test-enabled'.
If the function did run, the value is a cons cell, the `cdr'
being the result.")

(defun tramp--test-enabled ()
  "Whether remote file access is enabled."
  (unless (consp tramp--test-enabled-checked)
    (setq
     tramp--test-enabled-checked
     (cons
      t (ignore-errors
	  (and
	   (file-remote-p ert-remote-temporary-file-directory)
	   (file-directory-p ert-remote-temporary-file-directory)
	   (file-writable-p ert-remote-temporary-file-directory))))))

  (when (cdr tramp--test-enabled-checked)
    ;; Remove old test files.
    (dolist (dir `(,temporary-file-directory
		   ,ert-remote-temporary-file-directory))
      (dolist (file (directory-files dir 'full (rx bos (? ".#") "tramp-test")))
	(ignore-errors
	  (if (file-directory-p file)
	      (delete-directory file 'recursive)
	    (delete-file file)))))
    ;; Cleanup connection.
    (ignore-errors
      (tramp-cleanup-connection tramp-test-vec nil 'keep-password)))

  ;; Return result.
  (cdr tramp--test-enabled-checked))

(defun tramp--test-make-temp-name (&optional local quoted)
  "Return a temporary file name for test.
If LOCAL is non-nil, a local file name is returned.
If QUOTED is non-nil, the local part of the file name is quoted.
The temporary file is not created."
  (funcall
   (if quoted #'file-name-quote #'identity)
   (expand-file-name
    (make-temp-name "tramp-test")
    (if local temporary-file-directory ert-remote-temporary-file-directory))))

;; Method "smb" supports `make-symbolic-link' only if the remote host
;; has CIFS capabilities.  tramp-adb.el, tramp-gvfs.el, tramp-rclone.el
;; and tramp-sshfs.el do not support symbolic links at all.
(defmacro tramp--test-ignore-make-symbolic-link-error (&rest body)
  "Run BODY, ignoring \"make-symbolic-link not supported\" file error."
  (declare (indent defun) (debug (body)))
  `(condition-case err
       (progn ,@body)
     (file-error
      (unless (string-equal (error-message-string err)
			    "make-symbolic-link not supported")
	(signal (car err) (cdr err))))))

;; Don't print messages in nested `tramp--test-instrument-test-case' calls.
(defvar tramp--test-instrument-test-case-p nil
  "Whether `tramp--test-instrument-test-case' run.
This shall used dynamically bound only.")

;; When `tramp-verbose' is greater than 10, and you want to trace
;; other functions as well, do something like
;; (let ((tramp-trace-functions '(file-name-non-special)))
;;   (tramp--test-instrument-test-case 11
;;     ...))
(defmacro tramp--test-instrument-test-case (verbose &rest body)
  "Run BODY with `tramp-verbose' equal VERBOSE.
Print the content of the Tramp connection and debug buffers, if
`tramp-verbose' is greater than 3.  Print traces if `tramp-verbose'
is greater than 10.
`should-error' is not handled properly.  BODY shall not contain a timeout."
  (declare (indent 1) (debug (natnump body)))
  `(let* ((tramp-verbose (max (or ,verbose 0) (or tramp-verbose 0)))
	  (debug-ignored-errors
	   (append
	    '("\\`make-symbolic-link not supported\\'"
	      "\\`error with add-name-to-file")
	    debug-ignored-errors))
	  inhibit-message)
     (unwind-protect
	 (let ((tramp--test-instrument-test-case-p t)) ,@body)
       ;; Unwind forms.
       (when (and (null tramp--test-instrument-test-case-p) (> tramp-verbose 3))
	 (untrace-all)
	 (dolist (buf (tramp-list-tramp-buffers))
	   (message ";; %s\n%s" buf (tramp-get-buffer-string buf))
	   (kill-buffer buf))))))

(defsubst tramp--test-message (fmt-string &rest arguments)
  "Emit a message into ERT *Messages*."
  (tramp--test-instrument-test-case 0
    (apply #'tramp-message tramp-test-vec 0 fmt-string arguments)))

(defsubst tramp--test-backtrace ()
  "Dump a backtrace into ERT *Messages*."
  (tramp--test-instrument-test-case 10
    (tramp-backtrace tramp-test-vec)))

(defmacro tramp--test-print-duration (message &rest body)
  "Run BODY and print a message with duration, prompted by MESSAGE."
  (declare (indent 1) (debug (stringp body)))
  `(let ((start (current-time)))
     (unwind-protect
	 (progn ,@body)
       (tramp--test-message
	"%s %f sec" ,message (float-time (time-subtract nil start))))))

(ert-deftest tramp-test00-availability ()
  "Test availability of Tramp functions."
  :expected-result (if (tramp--test-enabled) :passed :failed)
  (tramp--test-message
   "Remote directory: `%s'" ert-remote-temporary-file-directory)
  (should (ignore-errors
	    (and
	     (file-remote-p ert-remote-temporary-file-directory)
	     (file-directory-p ert-remote-temporary-file-directory)
	     (file-writable-p ert-remote-temporary-file-directory)))))

(ert-deftest tramp-test01-file-name-syntax ()
  "Check remote file name syntax."
  (let ((syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'default)
	  ;; Simple cases.
	  (should (tramp-tramp-file-p "/method::"))
	  (should (tramp-tramp-file-p "/method:host:"))
	  (should (tramp-tramp-file-p "/method:user@:"))
	  (should (tramp-tramp-file-p "/method:user@host:"))
	  (should (tramp-tramp-file-p "/method:user@email@host:"))

	  ;; Using a port.
	  (should (tramp-tramp-file-p "/method:host#1234:"))
	  (should (tramp-tramp-file-p "/method:user@host#1234:"))

	  ;; Using an IPv4 address.
	  (should (tramp-tramp-file-p "/method:1.2.3.4:"))
	  (should (tramp-tramp-file-p "/method:user@1.2.3.4:"))

	  ;; Using an IPv4 address with port.
	  (should (tramp-tramp-file-p "/method:1.2.3.4#1234:"))
	  (should (tramp-tramp-file-p "/method:user@1.2.3.4#1234:"))

	  ;; Using an IPv6 address.
	  (should (tramp-tramp-file-p "/method:[::1]:"))
	  (should (tramp-tramp-file-p "/method:user@[::1]:"))

	  ;; Using an IPv4 mapped IPv6 address.
	  (should (tramp-tramp-file-p "/method:[::ffff:1.2.3.4]:"))
	  (should (tramp-tramp-file-p "/method:user@[::ffff:1.2.3.4]:"))

	  ;; Using an IPv6 address with port.
	  (should (tramp-tramp-file-p "/method:[::1]#1234:"))
	  (should (tramp-tramp-file-p "/method:user@[::1]#1234:"))

	  ;; Local file name part.
	  (should (tramp-tramp-file-p "/method:::"))
	  (should (tramp-tramp-file-p "/method::/:"))
	  (should (tramp-tramp-file-p "/method::/path/to/file"))
	  (should (tramp-tramp-file-p "/method::/:/path/to/file"))
	  (should (tramp-tramp-file-p "/method::file"))
	  (should (tramp-tramp-file-p "/method::/:file"))

	  ;; Multihop.
	  (should (tramp-tramp-file-p "/method1:|method2::"))
	  (should
	   (tramp-tramp-file-p "/method1:host1|method2:host2:"))
	  (should
	   (tramp-tramp-file-p "/method1:user1@host1|method2:user2@host2:"))
	  (should
	   (tramp-tramp-file-p
	    "/method1:user1@host1|method2:user2@host2|method3:user3@host3:"))

	  ;; No strings.
	  (should-not (tramp-tramp-file-p nil))
	  (should-not (tramp-tramp-file-p 'symbol))
	  ;; No newline or linefeed.
	  (should-not (tramp-tramp-file-p "/method::file\nname"))
	  (should-not (tramp-tramp-file-p "/method::file\rname"))
	  ;; Ange-FTP syntax.
	  (should-not (tramp-tramp-file-p "/host:"))
	  (should-not (tramp-tramp-file-p "/user@host:"))
	  (should-not (tramp-tramp-file-p "/1.2.3.4:"))
	  (should-not (tramp-tramp-file-p "/[]:"))
	  (should-not (tramp-tramp-file-p "/[::1]:"))
	  (should-not (tramp-tramp-file-p "/[::ffff:1.2.3.4]:"))
	  (should-not (tramp-tramp-file-p "/host:/:"))
	  (should-not (tramp-tramp-file-p "/host1|host2:"))
	  (should-not (tramp-tramp-file-p "/user1@host1|user2@host2:"))
	  ;; Quote with "/:" suppresses file name handlers.
	  (should-not (tramp-tramp-file-p "/::"))
	  (should-not (tramp-tramp-file-p "/:@:"))
	  (should-not (tramp-tramp-file-p "/:[]:"))
	  ;; When `tramp-mode' is nil, Tramp is not activated.
	  (let (tramp-mode)
	    (should-not (tramp-tramp-file-p "/method:user@host:")))
	  ;; `tramp-ignored-file-name-regexp' suppresses Tramp.
	  (let ((tramp-ignored-file-name-regexp "\\`/method:user@host:"))
	    (should-not (tramp-tramp-file-p "/method:user@host:")))
	  ;; Methods shall be at least two characters, except the
	  ;; default method.
	  (let ((system-type 'windows-nt))
	    (should-not (tramp-tramp-file-p "/c:/path/to/file"))
	    (should-not (tramp-tramp-file-p "/c::/path/to/file"))
	    (should (tramp-tramp-file-p "/-::/path/to/file"))
	    (should (tramp-tramp-file-p "/mm::/path/to/file")))
	  (let ((system-type 'gnu/linux))
	    (should-not (tramp-tramp-file-p "/m::/path/to/file"))
	    (should (tramp-tramp-file-p "/-:h:/path/to/file"))
	    (should (tramp-tramp-file-p "/mm::/path/to/file"))))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test01-file-name-syntax-simplified ()
  "Check simplified file name syntax."
  :tags '(:expensive-test)
  (let ((syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'simplified)
	  ;; Simple cases.
	  (should (tramp-tramp-file-p "/host:"))
	  (should (tramp-tramp-file-p "/user@:"))
	  (should (tramp-tramp-file-p "/user@host:"))
	  (should (tramp-tramp-file-p "/user@email@host:"))

	  ;; Using a port.
	  (should (tramp-tramp-file-p "/host#1234:"))
	  (should (tramp-tramp-file-p "/user@host#1234:"))

	  ;; Using an IPv4 address.
	  (should (tramp-tramp-file-p "/1.2.3.4:"))
	  (should (tramp-tramp-file-p "/user@1.2.3.4:"))

	  ;; Using an IPv4 address with port.
	  (should (tramp-tramp-file-p "/1.2.3.4#1234:"))
	  (should (tramp-tramp-file-p "/user@1.2.3.4#1234:"))

	  ;; Using an IPv6 address.
	  (should (tramp-tramp-file-p "/[::1]:"))
	  (should (tramp-tramp-file-p "/user@[::1]:"))

	  ;; Using an IPv4 mapped IPv6 address.
	  (should (tramp-tramp-file-p "/[::ffff:1.2.3.4]:"))
	  (should (tramp-tramp-file-p "/user@[::ffff:1.2.3.4]:"))

	  ;; Using an IPv6 address with port.
	  (should (tramp-tramp-file-p "/[::1]#1234:"))
	  (should (tramp-tramp-file-p "/user@[::1]#1234:"))

	  ;; Local file name part.
	  (should (tramp-tramp-file-p "/host::"))
	  (should (tramp-tramp-file-p "/host:/:"))
	  (should (tramp-tramp-file-p "/host:/path/to/file"))
	  (should (tramp-tramp-file-p "/host:/:/path/to/file"))
	  (should (tramp-tramp-file-p "/host:file"))
	  (should (tramp-tramp-file-p "/host:/:file"))

	  ;; Multihop.
	  (should (tramp-tramp-file-p "/host1|host2:"))
	  (should (tramp-tramp-file-p "/user1@host1|user2@host2:"))
	  (should (tramp-tramp-file-p "/user1@host1|user2@host2|user3@host3:"))

	  ;; No strings.
	  (should-not (tramp-tramp-file-p nil))
	  (should-not (tramp-tramp-file-p 'symbol))
	  ;; Quote with "/:" suppresses file name handlers.
	  (should-not (tramp-tramp-file-p "/::"))
	  (should-not (tramp-tramp-file-p "/:@:"))
	  (should-not (tramp-tramp-file-p "/:[]:")))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test01-file-name-syntax-separate ()
  "Check separate file name syntax."
  :tags '(:expensive-test)
  (let ((syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'separate)
	  ;; Simple cases.
	  (should (tramp-tramp-file-p "/[method/]"))
	  (should (tramp-tramp-file-p "/[method/host]"))
	  (should (tramp-tramp-file-p "/[method/user@]"))
	  (should (tramp-tramp-file-p "/[method/user@host]"))
	  (should (tramp-tramp-file-p "/[method/user@email@host]"))

	  ;; Using a port.
	  (should (tramp-tramp-file-p "/[method/host#1234]"))
	  (should (tramp-tramp-file-p "/[method/user@host#1234]"))

	  ;; Using an IPv4 address.
	  (should (tramp-tramp-file-p "/[method/1.2.3.4]"))
	  (should (tramp-tramp-file-p "/[method/user@1.2.3.4]"))

	  ;; Using an IPv4 address with port.
	  (should (tramp-tramp-file-p "/[method/1.2.3.4#1234]"))
	  (should (tramp-tramp-file-p "/[method/user@1.2.3.4#1234]"))

	  ;; Using an IPv6 address.
	  (should (tramp-tramp-file-p "/[method/::1]"))
	  (should (tramp-tramp-file-p "/[method/user@::1]"))

	  ;; Using an IPv4 mapped IPv6 address.
	  (should (tramp-tramp-file-p "/[method/::ffff:1.2.3.4]"))
	  (should (tramp-tramp-file-p "/[method/user@::ffff:1.2.3.4]"))

	  ;; Using an IPv6 address with port.
	  (should (tramp-tramp-file-p "/[method/::1#1234]"))
	  (should (tramp-tramp-file-p "/[method/user@::1#1234]"))

	  ;; Local file name part.
	  (should (tramp-tramp-file-p "/[method/]"))
	  (should (tramp-tramp-file-p "/[method/]/:"))
	  (should (tramp-tramp-file-p "/[method/]/path/to/file"))
	  (should (tramp-tramp-file-p "/[method/]/:/path/to/file"))
	  (should (tramp-tramp-file-p "/[method/]file"))
	  (should (tramp-tramp-file-p "/[method/]/:file"))

	  ;; Multihop.
	  (should (tramp-tramp-file-p "/[method1/|method2/]"))
	  (should (tramp-tramp-file-p "/[method1/host1|method2/host2]"))
	  (should
	   (tramp-tramp-file-p
	    "/[method1/user1@host1|method2/user2@host2]"))
	  (should
	   (tramp-tramp-file-p
	    "/[method1/user1@host1|method2/user2@host2|method3/user3@host3]"))

	  ;; No strings.
	  (should-not (tramp-tramp-file-p nil))
	  (should-not (tramp-tramp-file-p 'symbol))
	  ;; Ange-FTP syntax.
	  (should-not (tramp-tramp-file-p "/host:"))
	  (should-not (tramp-tramp-file-p "/user@host:"))
	  (should-not (tramp-tramp-file-p "/1.2.3.4:"))
	  (should-not (tramp-tramp-file-p "/host:/:"))
	  (should-not (tramp-tramp-file-p "/host1|host2:"))
	  (should-not (tramp-tramp-file-p "/user1@host1|user2@host2:"))
	  ;; Quote with "/:" suppresses file name handlers.
	  (should-not (tramp-tramp-file-p "/:[]")))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test02-file-name-dissect ()
  "Check remote file name components."
  (let ((tramp-default-method "default-method")
	(tramp-default-user "default-user")
	(tramp-default-host "default-host")
	tramp-default-method-alist
	tramp-default-user-alist
	tramp-default-host-alist
	tramp-default-proxies-alist
	;; Suppress method name check.
	(non-essential t)
	;; Suppress check for multihops.
	(tramp-cache-data (make-hash-table :test #'equal))
	(tramp-connection-properties '((nil "login-program" t)))
	(syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'default)
	  ;; An unknown method shall raise an error.
	  (let (non-essential)
	    (should-error
	     (expand-file-name "/method:user@host:")
	     :type 'user-error))

	  ;; Expand `tramp-default-user' and `tramp-default-host'.
	  (should
	   (string-equal
	    (file-remote-p "/method::")
	    (format "/%s:%s@%s:" "method" "default-user" "default-host")))
	  (should (string-equal (file-remote-p "/method::" 'method) "method"))
	  (should
	   (string-equal (file-remote-p "/method::" 'user) "default-user"))
	  (should
	   (string-equal (file-remote-p "/method::" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/method::" 'localname) ""))
	  (should (string-equal (file-remote-p "/method::" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should
	   (string-equal
	    (file-remote-p "/-:host:")
	    (format "/%s:%s@%s:" "default-method" "default-user" "host")))
	  (should
	   (string-equal (file-remote-p "/-:host:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:host:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/-:host:" 'host) "host"))
	  (should (string-equal (file-remote-p "/-:host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:host:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-host'.
	  (should
	   (string-equal
	    (file-remote-p "/-:user@:")
	    (format "/%s:%s@%s:" "default-method" "user" "default-host")))
	  (should
	   (string-equal (file-remote-p "/-:user@:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/-:user@:" 'user) "user"))
	  (should
	   (string-equal (file-remote-p "/-:user@:" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/-:user@:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:user@:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/-:user@host:")
		   (format "/%s:%s@%s:" "default-method" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/-:user@host:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/-:user@host:" 'user) "user"))
	  (should (string-equal (file-remote-p "/-:user@host:" 'host) "host"))
	  (should (string-equal (file-remote-p "/-:user@host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:user@host:" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/method:host:")
		   (format "/%s:%s@%s:" "method" "default-user" "host")))
	  (should
	   (string-equal (file-remote-p "/method:host:" 'method) "method"))
	  (should
	   (string-equal (file-remote-p "/method:host:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/method:host:" 'host) "host"))
	  (should (string-equal (file-remote-p "/method:host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:host:" 'hop) nil))

	  ;; Expand `tramp-default-host'.
	  (should
	   (string-equal
	    (file-remote-p "/method:user@:")
	    (format "/%s:%s@%s:" "method" "user" "default-host")))
	  (should
	   (string-equal (file-remote-p "/method:user@:" 'method) "method"))
	  (should (string-equal (file-remote-p "/method:user@:" 'user) "user"))
	  (should
	   (string-equal (file-remote-p "/method:user@:" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/method:user@:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:user@:" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/method:user@host:")
		   (format "/%s:%s@%s:" "method" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/method:user@host:" 'method) "method"))
	  (should
	   (string-equal (file-remote-p "/method:user@host:" 'user) "user"))
	  (should
	   (string-equal (file-remote-p "/method:user@host:" 'host) "host"))
	  (should
	   (string-equal (file-remote-p "/method:user@host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:user@host:" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/method:user@email@host:")
		   (format "/%s:%s@%s:" "method" "user@email" "host")))
	  (should (string-equal
		   (file-remote-p "/method:user@email@host:" 'method) "method"))
	  (should
	   (string-equal
	    (file-remote-p "/method:user@email@host:" 'user) "user@email"))
	  (should (string-equal
		   (file-remote-p "/method:user@email@host:" 'host) "host"))
	  (should (string-equal
		   (file-remote-p "/method:user@email@host:" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/method:user@email@host:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should
	   (string-equal
	    (file-remote-p "/-:host#1234:")
	    (format "/%s:%s@%s:" "default-method" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/-:host#1234:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:host#1234:" 'user) "default-user"))
	  (should
	   (string-equal (file-remote-p "/-:host#1234:" 'host) "host#1234"))
	  (should (string-equal (file-remote-p "/-:host#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:host#1234:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/-:user@host#1234:")
		   (format "/%s:%s@%s:" "default-method" "user" "host#1234")))
	  (should
	   (string-equal
	    (file-remote-p "/-:user@host#1234:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:user@host#1234:" 'user) "user"))
	  (should
	   (string-equal
	    (file-remote-p "/-:user@host#1234:" 'host) "host#1234"))
	  (should
	   (string-equal (file-remote-p "/-:user@host#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:user@host#1234:" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/method:host#1234:")
		   (format "/%s:%s@%s:" "method" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/method:host#1234:" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/method:host#1234:" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/method:host#1234:" 'host) "host#1234"))
	  (should
	   (string-equal (file-remote-p "/method:host#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:host#1234:" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:")
		   (format "/%s:%s@%s:" "method" "user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/method:user@host#1234:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should
	   (string-equal
	    (file-remote-p "/-:1.2.3.4:")
	    (format "/%s:%s@%s:" "default-method" "default-user" "1.2.3.4")))
	  (should
	   (string-equal
	    (file-remote-p "/-:1.2.3.4:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:1.2.3.4:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/-:1.2.3.4:" 'host) "1.2.3.4"))
	  (should (string-equal (file-remote-p "/-:1.2.3.4:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:1.2.3.4:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/-:user@1.2.3.4:")
		   (format "/%s:%s@%s:" "default-method" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/-:user@1.2.3.4:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:user@1.2.3.4:" 'user) "user"))
	  (should
	   (string-equal (file-remote-p "/-:user@1.2.3.4:" 'host) "1.2.3.4"))
	  (should
	   (string-equal (file-remote-p "/-:user@1.2.3.4:" 'localname) ""))
	  (should
	   (string-equal (file-remote-p "/-:user@1.2.3.4:" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/method:1.2.3.4:")
		   (format "/%s:%s@%s:" "method" "default-user" "1.2.3.4")))
	  (should
	   (string-equal (file-remote-p "/method:1.2.3.4:" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/method:1.2.3.4:" 'user) "default-user"))
	  (should
	   (string-equal (file-remote-p "/method:1.2.3.4:" 'host) "1.2.3.4"))
	  (should
	   (string-equal (file-remote-p "/method:1.2.3.4:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:1.2.3.4:" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/method:user@1.2.3.4:")
		   (format "/%s:%s@%s:" "method" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/method:user@1.2.3.4:" 'method) "method"))
	  (should
	   (string-equal (file-remote-p "/method:user@1.2.3.4:" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/method:user@1.2.3.4:" 'host) "1.2.3.4"))
	  (should (string-equal
		   (file-remote-p "/method:user@1.2.3.4:" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/method:user@1.2.3.4:" 'hop) nil))

	  ;; Expand `tramp-default-method', `tramp-default-user' and
	  ;; `tramp-default-host'.
	  (should
	   (string-equal
	    (file-remote-p "/-:[]:")
	    (format
	     "/%s:%s@%s:" "default-method" "default-user" "default-host")))
	  (should
	   (string-equal (file-remote-p "/-:[]:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/-:[]:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/-:[]:" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/-:[]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:[]:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (let ((tramp-default-host "::1"))
	    (should
	     (string-equal
	      (file-remote-p "/-:[]:")
	      (format "/%s:%s@%s:" "default-method" "default-user" "[::1]")))
	    (should
	     (string-equal (file-remote-p "/-:[]:" 'method) "default-method"))
	    (should
	     (string-equal (file-remote-p "/-:[]:" 'user) "default-user"))
	    (should (string-equal (file-remote-p "/-:[]:" 'host) "::1"))
	    (should (string-equal (file-remote-p "/-:[]:" 'localname) ""))
	    (should (string-equal (file-remote-p "/-:[]:" 'hop) nil)))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should
	   (string-equal
	    (file-remote-p "/-:[::1]:")
	    (format "/%s:%s@%s:" "default-method" "default-user" "[::1]")))
	  (should
	   (string-equal (file-remote-p "/-:[::1]:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/-:[::1]:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/-:[::1]:" 'host) "::1"))
	  (should (string-equal (file-remote-p "/-:[::1]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:[::1]:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/-:user@[::1]:")
		   (format "/%s:%s@%s:" "default-method" "user" "[::1]")))
	  (should (string-equal
		   (file-remote-p "/-:user@[::1]:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/-:user@[::1]:" 'user) "user"))
	  (should (string-equal (file-remote-p "/-:user@[::1]:" 'host) "::1"))
	  (should (string-equal (file-remote-p "/-:user@[::1]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/-:user@[::1]:" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/method:[::1]:")
		   (format "/%s:%s@%s:" "method" "default-user" "[::1]")))
	  (should
	   (string-equal (file-remote-p "/method:[::1]:" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/method:[::1]:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/method:[::1]:" 'host) "::1"))
	  (should (string-equal (file-remote-p "/method:[::1]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/method:[::1]:" 'hop) nil))

	  ;; No expansion.  Hop.
	  (should (string-equal
		   (file-remote-p "/method:user@[::1]#1234:")
		   (format "/%s:%s@%s#%s:" "method" "user" "[::1]" "1234")))
	  (should (string-equal
		   (file-remote-p "/method:user@[::1]#1234:" 'method) "method"))
	  (should (string-equal (file-remote-p "/method:user@[::1]#1234:" 'user)
				"user"))
	  (should (string-equal
		   (file-remote-p "/method:user@[::1]#1234:" 'host) "::1#1234"))
	  (should (string-equal
		   (file-remote-p "/method:user@[::1]#1234:" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/method:user@[::1]#1234:" 'hop) nil))

	  ;; Local file name part.
	  (should (string-equal (file-remote-p "/-:host:/:" 'localname) "/:"))
	  (should (string-equal (file-remote-p "/method:::" 'localname) ":"))
	  (should (string-equal (file-remote-p "/method:: " 'localname) " "))
	  (should
	   (string-equal (file-remote-p "/method::file" 'localname) "file"))
	  (should (string-equal
		   (file-remote-p "/method::/path/to/file" 'localname)
		   "/path/to/file"))

	  ;; Multihop.
	  (dolist (tramp-show-ad-hoc-proxies '(nil t))

	    ;; Explicit settings in `tramp-default-proxies-alist'
	    ;; shouldn't show hops.
	    (setq tramp-default-proxies-alist
		  '(("^host2$" "^user2$" "/method1:user1@host1:")))
	    (should
	     (string-equal
	      (file-remote-p "/method2:user2@host2:/path/to/file")
	      "/method2:user2@host2:"))
	    (setq tramp-default-proxies-alist nil)

	    ;; Ad-hoc settings.
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file")
	      (if tramp-show-ad-hoc-proxies
		  "/method1:user1@host1|method2:user2@host2:"
		"/method2:user2@host2:")))
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file" 'method)
	      "method2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file" 'user)
	      "user2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file" 'host)
	      "host2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file"
	       'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/method1:user1@host1|method2:user2@host2:/path/to/file" 'hop)
	      (format "%s:%s@%s|"
		      "method1" "user1" "host1")))

	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user1@host1"
		   "|method2:user2@host2"
		   "|method3:user3@host3:")
		"/method3:user3@host3:")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file")
	       'method)
	      "method3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file")
	       'user)
	      "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file")
	       'host)
	      "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file")
	       'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@host2"
		"|method3:user3@host3:/path/to/file")
	       'hop)
	      (format "%s:%s@%s|%s:%s@%s|"
		      "method1" "user1" "host1" "method2" "user2" "host2")))

	    ;; Expand `tramp-default-method-alist'.
	    (add-to-list
	     'tramp-default-method-alist '("host1" "user1" "method1"))
	    (add-to-list
	     'tramp-default-method-alist '("host2" "user2" "method2"))
	    (add-to-list
	     'tramp-default-method-alist '("host3" "user3" "method3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/-:user1@host1"
		"|-:user2@host2"
		"|-:user3@host3:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user1@host1"
		   "|method2:user2@host2"
		   "|method3:user3@host3:")
		"/method3:user3@host3:")))

	    ;; Expand `tramp-default-user-alist'.
	    (add-to-list 'tramp-default-user-alist '("method1" "host1" "user1"))
	    (add-to-list 'tramp-default-user-alist '("method2" "host2" "user2"))
	    (add-to-list 'tramp-default-user-alist '("method3" "host3" "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:host1"
		"|method2:host2"
		"|method3:host3:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user1@host1"
		   "|method2:user2@host2"
		   "|method3:user3@host3:")
		"/method3:user3@host3:")))

	    ;; Expand `tramp-default-host-alist'.
	    (add-to-list 'tramp-default-host-alist '("method1" "user1" "host1"))
	    (add-to-list 'tramp-default-host-alist '("method2" "user2" "host2"))
	    (add-to-list 'tramp-default-host-alist '("method3" "user3" "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@"
		"|method2:user2@"
		"|method3:user3@:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user1@host1"
		   "|method2:user2@host2"
		   "|method3:user3@host3:")
		"/method3:user3@host3:")))

	    ;; Ad-hoc user name and host name expansion.
	    (setq tramp-default-method-alist nil
		  tramp-default-user-alist nil
		  tramp-default-host-alist nil)
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:user1@host1"
		"|method2:user2@"
		"|method3:user3@:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user1@host1"
		   "|method2:user2@host1"
		   "|method3:user3@host1:")
		"/method3:user3@host1:")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/method1:%u@%h"
		"|method2:user2@host2"
		"|method3:%u@%h"
		"|method4:user4%domain4@host4#1234:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/method1:user2@host2"
		   "|method2:user2@host2"
		   "|method3:user4@host4"
		   "|method4:user4%domain4@host4#1234:")
		"/method4:user4%domain4@host4#1234:")))))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test02-file-name-dissect-simplified ()
  "Check simplified file name components."
  :tags '(:expensive-test)
  (let ((tramp-default-method "default-method")
	(tramp-default-user "default-user")
	(tramp-default-host "default-host")
	tramp-default-user-alist
	tramp-default-host-alist
	tramp-default-proxies-alist
	;; Suppress method name check.
	(non-essential t)
	;; Suppress check for multihops.
	(tramp-cache-data (make-hash-table :test #'equal))
	(tramp-connection-properties '((nil "login-program" t)))
	(syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'simplified)
	  ;; An unknown default method shall raise an error.
	  (let (non-essential)
	    (should-error
	     (expand-file-name "/user@host:")
	     :type 'user-error))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/host:")
		   (format "/%s@%s:" "default-user" "host")))
	  (should (string-equal
		   (file-remote-p "/host:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/host:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/host:" 'host) "host"))
	  (should (string-equal (file-remote-p "/host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/host:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/user@:")
		   (format "/%s@%s:" "user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/user@:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/user@:" 'user) "user"))
	  (should (string-equal (file-remote-p "/user@:" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/user@:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/user@host:")
		   (format "/%s@%s:" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/user@host:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/user@host:" 'user) "user"))
	  (should (string-equal (file-remote-p "/user@host:" 'host) "host"))
	  (should (string-equal (file-remote-p "/user@host:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@host:" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/user@email@host:")
		   (format "/%s@%s:" "user@email" "host")))
	  (should (string-equal
		   (file-remote-p "/user@email@host:" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/user@email@host:" 'user) "user@email"))
	  (should (string-equal
		   (file-remote-p "/user@email@host:" 'host) "host"))
	  (should (string-equal
		   (file-remote-p "/user@email@host:" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/user@email@host:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/host#1234:")
		   (format "/%s@%s:" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/host#1234:" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/host#1234:" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/host#1234:" 'host) "host#1234"))
	  (should (string-equal (file-remote-p "/host#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/host#1234:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/user@host#1234:")
		   (format "/%s@%s:" "user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/user@host#1234:" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/user@host#1234:" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/user@host#1234:" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/user@host#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@host#1234:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/1.2.3.4:")
		   (format "/%s@%s:" "default-user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/1.2.3.4:" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/1.2.3.4:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/1.2.3.4:" 'host) "1.2.3.4"))
	  (should (string-equal (file-remote-p "/1.2.3.4:" 'localname) ""))
	  (should (string-equal (file-remote-p "/1.2.3.4:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/user@1.2.3.4:")
		   (format "/%s@%s:" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/user@1.2.3.4:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/user@1.2.3.4:" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/user@1.2.3.4:" 'host) "1.2.3.4"))
	  (should (string-equal (file-remote-p "/user@1.2.3.4:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@1.2.3.4:" 'hop) nil))

	  ;; Expand `tramp-default-method', `tramp-default-user' and
	  ;; `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[]:")
		   (format
		    "/%s@%s:" "default-user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[]:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[]:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[]:" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/[]:" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (let ((tramp-default-host "::1"))
	    (should (string-equal
		     (file-remote-p "/[]:")
		     (format "/%s@%s:" "default-user" "[::1]")))
	    (should (string-equal
		     (file-remote-p "/[]:" 'method) "default-method"))
	    (should (string-equal (file-remote-p "/[]:" 'user) "default-user"))
	    (should (string-equal (file-remote-p "/[]:" 'host) "::1"))
	    (should (string-equal (file-remote-p "/[]:" 'localname) ""))
	    (should (string-equal (file-remote-p "/[]:" 'hop) nil)))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[::1]:")
		   (format "/%s@%s:" "default-user" "[::1]")))
	  (should (string-equal
		   (file-remote-p "/[::1]:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[::1]:" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[::1]:" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[::1]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/[::1]:" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/user@[::1]:")
		   (format "/%s@%s:" "user" "[::1]")))
	  (should (string-equal
		   (file-remote-p "/user@[::1]:" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/user@[::1]:" 'user) "user"))
	  (should (string-equal (file-remote-p "/user@[::1]:" 'host) "::1"))
	  (should (string-equal (file-remote-p "/user@[::1]:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@[::1]:" 'hop) nil))

	  ;; No expansion.  Hop.
	  (should (string-equal
		   (file-remote-p "/user@[::1]#1234:")
		   (format "/%s@%s#%s:" "user" "[::1]" "1234")))
	  (should (string-equal
		   (file-remote-p "/user@[::1]#1234:" 'method) "default-method"))
	  (should
	   (string-equal (file-remote-p "/user@[::1]#1234:" 'user) "user"))
	  (should
	   (string-equal (file-remote-p "/user@[::1]#1234:" 'host) "::1#1234"))
	  (should
	   (string-equal (file-remote-p "/user@[::1]#1234:" 'localname) ""))
	  (should (string-equal (file-remote-p "/user@[::1]#1234:" 'hop) nil))

	  ;; Local file name part.
	  (should (string-equal (file-remote-p "/host:/:" 'localname) "/:"))
	  (should (string-equal (file-remote-p "/host::" 'localname) ":"))
	  (should (string-equal (file-remote-p "/host: " 'localname) " "))
	  (should (string-equal (file-remote-p "/host:file" 'localname) "file"))
	  (should (string-equal
		   (file-remote-p "/host:/path/to/file" 'localname)
		   "/path/to/file"))

	  ;; Multihop.
	  (dolist (tramp-show-ad-hoc-proxies '(nil t))

	    ;; Explicit settings in `tramp-default-proxies-alist'
	    ;; shouldn't show hops.
	    (setq tramp-default-proxies-alist
		  '(("^host2$" "^user2$" "/user1@host1:")))
	    (should
	     (string-equal
	      (file-remote-p "/user2@host2:/path/to/file")
	      "/user2@host2:"))
	    (setq tramp-default-proxies-alist nil)

	    ;; Ad-hoc settings.
	    (should
	     (string-equal
	      (file-remote-p "/user1@host1|user2@host2:/path/to/file")
	      (if tramp-show-ad-hoc-proxies
		  "/user1@host1|user2@host2:"
		"/user2@host2:")))
	    (should
	     (string-equal
	      (file-remote-p
	       "/user1@host1|user2@host2:/path/to/file" 'method)
	      "default-method"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/user1@host1|user2@host2:/path/to/file" 'user)
	      "user2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/user1@host1|user2@host2:/path/to/file" 'host)
	      "host2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/user1@host1|user2@host2:/path/to/file" 'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/user1@host1|user2@host2:/path/to/file" 'hop)
	      (format "%s@%s|" "user1" "host1")))

	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/user1@host1"
		   "|user2@host2"
		   "|user3@host3:")
		"/user3@host3:")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file")
	       'method)
	      "default-method"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file")
	       'user)
	      "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file")
	       'host)
	      "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file")
	       'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@host2"
		"|user3@host3:/path/to/file")
	       'hop)
	      (format "%s@%s|%s@%s|"
		      "user1" "host1" "user2" "host2")))

	    ;; Expand `tramp-default-user-alist'.
	    (add-to-list 'tramp-default-user-alist '(nil "host1" "user1"))
	    (add-to-list 'tramp-default-user-alist '(nil "host2" "user2"))
	    (add-to-list 'tramp-default-user-alist '(nil "host3" "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/host1"
		"|host2"
		"|host3:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/user1@host1"
		   "|user2@host2"
		   "|user3@host3:")
		"/user3@host3:")))

	    ;; Expand `tramp-default-host-alist'.
	    (add-to-list 'tramp-default-host-alist '(nil "user1" "host1"))
	    (add-to-list 'tramp-default-host-alist '(nil "user2" "host2"))
	    (add-to-list 'tramp-default-host-alist '(nil "user3" "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@"
		"|user2@"
		"|user3@:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/user1@host1"
		   "|user2@host2"
		   "|user3@host3:")
		"/user3@host3:")))

	    ;; Ad-hoc user name and host name expansion.
	    (setq tramp-default-user-alist nil
		  tramp-default-host-alist nil)
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/user1@host1"
		"|user2@"
		"|user3@:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/user1@host1"
		   "|user2@host1"
		   "|user3@host1:")
		"/user3@host1:")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/%u@%h"
		"|user2@host2"
		"|%u@%h"
		"|user4%domain4@host4#1234:/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/user2@host2"
		   "|user2@host2"
		   "|user4@host4"
		   "|user4%domain4@host4#1234:")
		"/user4%domain4@host4#1234:")))))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test02-file-name-dissect-separate ()
  "Check separate file name components."
  :tags '(:expensive-test)
  (let ((tramp-default-method "default-method")
	(tramp-default-user "default-user")
	(tramp-default-host "default-host")
	tramp-default-method-alist
	tramp-default-user-alist
	tramp-default-host-alist
	tramp-default-proxies-alist
	;; Suppress method name check.
	(non-essential t)
	;; Suppress check for multihops.
	(tramp-cache-data (make-hash-table :test #'equal))
	(tramp-connection-properties '((nil "login-program" t)))
	(syntax tramp-syntax))
    (unwind-protect
	(progn
	  (tramp-change-syntax 'separate)
	  ;; An unknown method shall raise an error.
	  (let (non-essential)
	    (should-error
	     (expand-file-name "/[method/user@host]")
	     :type 'user-error))

	  ;; Expand `tramp-default-user' and `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[method/]")
		   (format
		    "/[%s/%s@%s]" "method" "default-user" "default-host")))
	  (should (string-equal (file-remote-p "/[method/]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[method/]" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[method/]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[/host]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "host")))
	  (should (string-equal
		   (file-remote-p "/[/host]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/host]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[/host]" 'host) "host"))
	  (should (string-equal (file-remote-p "/[/host]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/host]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[/user@]")
		   (format
		    "/[%s/%s@%s]" "default-method" "user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[/user@]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[/user@]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[/user@]" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[/user@]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/user@]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[/user@host]")
		   (format "/[%s/%s@%s]" "default-method" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/[/user@host]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[/user@host]" 'user) "user"))
	  (should (string-equal (file-remote-p "/[/user@host]" 'host) "host"))
	  (should (string-equal (file-remote-p "/[/user@host]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/user@host]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[-/host]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "host")))
	  (should (string-equal
		   (file-remote-p "/[-/host]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/host]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[-/host]" 'host) "host"))
	  (should (string-equal (file-remote-p "/[-/host]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/host]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[-/user@]")
		   (format
		    "/[%s/%s@%s]" "default-method" "user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[-/user@]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[-/user@]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[-/user@]" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[-/user@]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/user@]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[-/user@host]")
		   (format "/[%s/%s@%s]" "default-method" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/[-/user@host]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[-/user@host]" 'user) "user"))
	  (should (string-equal (file-remote-p "/[-/user@host]" 'host) "host"))
	  (should (string-equal (file-remote-p "/[-/user@host]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/user@host]" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[method/host]")
		   (format "/[%s/%s@%s]" "method" "default-user" "host")))
	  (should (string-equal
		   (file-remote-p "/[method/host]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/host]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[method/host]" 'host) "host"))
	  (should (string-equal (file-remote-p "/[method/host]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/host]" 'hop) nil))

	  ;; Expand `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[method/user@]")
		   (format "/[%s/%s@%s]" "method" "user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[method/user@]" 'method) "method"))
	  (should (string-equal (file-remote-p "/[method/user@]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[method/user@]" 'host) "default-host"))
	  (should (string-equal
		   (file-remote-p "/[method/user@]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/user@]" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/[method/user@host]")
		   (format "/[%s/%s@%s]" "method" "user" "host")))
	  (should (string-equal
		   (file-remote-p "/[method/user@host]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host]" 'host) "host"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host]" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/[method/user@host]" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]")
		   (format "/[%s/%s@%s]" "method" "user@email" "host")))
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]" 'user)
		   "user@email"))
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]" 'host) "host"))
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/[method/user@email@host]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[/host#1234]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[/host#1234]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/host#1234]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[/host#1234]" 'host) "host#1234"))
	  (should (string-equal (file-remote-p "/[/host#1234]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/host#1234]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[/user@host#1234]")
		   (format "/[%s/%s@%s]" "default-method" "user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[/user@host#1234]" 'method)
		   "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/user@host#1234]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[/user@host#1234]" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/[/user@host#1234]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/user@host#1234]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[-/host#1234]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[-/host#1234]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/host#1234]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[-/host#1234]" 'host) "host#1234"))
	  (should (string-equal (file-remote-p "/[-/host#1234]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/host#1234]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[-/user@host#1234]")
		   (format "/[%s/%s@%s]" "default-method" "user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[-/user@host#1234]" 'method)
		   "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/user@host#1234]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[-/user@host#1234]" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/[-/user@host#1234]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/user@host#1234]" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[method/host#1234]")
		   (format "/[%s/%s@%s]" "method" "default-user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[method/host#1234]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/host#1234]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[method/host#1234]" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/[method/host#1234]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/host#1234]" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]")
		   (format "/[%s/%s@%s]" "method" "user" "host#1234")))
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]" 'host) "host#1234"))
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/[method/user@host#1234]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[/1.2.3.4]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[/1.2.3.4]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/1.2.3.4]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[/1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal (file-remote-p "/[/1.2.3.4]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/1.2.3.4]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[/user@1.2.3.4]")
		   (format "/[%s/%s@%s]" "default-method" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[/user@1.2.3.4]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/user@1.2.3.4]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[/user@1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal
		   (file-remote-p "/[/user@1.2.3.4]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/user@1.2.3.4]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[-/1.2.3.4]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[-/1.2.3.4]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/1.2.3.4]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[-/1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal (file-remote-p "/[-/1.2.3.4]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/1.2.3.4]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[-/user@1.2.3.4]")
		   (format "/[%s/%s@%s]" "default-method" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[-/user@1.2.3.4]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/user@1.2.3.4]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[-/user@1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal
		   (file-remote-p "/[-/user@1.2.3.4]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/user@1.2.3.4]" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[method/1.2.3.4]")
		   (format "/[%s/%s@%s]" "method" "default-user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[method/1.2.3.4]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/1.2.3.4]" 'user) "default-user"))
	  (should (string-equal
		   (file-remote-p "/[method/1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal
		   (file-remote-p "/[method/1.2.3.4]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/1.2.3.4]" 'hop) nil))

	  ;; No expansion.
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]")
		   (format "/[%s/%s@%s]" "method" "user" "1.2.3.4")))
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]" 'host) "1.2.3.4"))
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/[method/user@1.2.3.4]" 'hop) nil))

	  ;; Expand `tramp-default-method', `tramp-default-user' and
	  ;; `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[/]")
		   (format
		    "/[%s/%s@%s]"
		    "default-method" "default-user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[/]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[/]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[/]" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[/]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (let ((tramp-default-host "::1"))
	    (should (string-equal
		     (file-remote-p "/[/]")
		     (format
		      "/[%s/%s@%s]"
		      "default-method" "default-user" "::1")))
	    (should (string-equal
		     (file-remote-p "/[/]" 'method) "default-method"))
	    (should (string-equal (file-remote-p "/[/]" 'user) "default-user"))
	    (should (string-equal (file-remote-p "/[/]" 'host) "::1"))
	    (should (string-equal (file-remote-p "/[/]" 'localname) ""))
	    (should (string-equal (file-remote-p "/[/]" 'hop) nil)))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[/::1]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "::1")))
	  (should (string-equal
		   (file-remote-p "/[/::1]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[/::1]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[/::1]" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[/::1]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/::1]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[/user@::1]")
		   (format "/[%s/%s@%s]" "default-method" "user" "::1")))
	  (should (string-equal
		   (file-remote-p "/[/user@::1]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[/user@::1]" 'user) "user"))
	  (should (string-equal (file-remote-p "/[/user@::1]" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[/user@::1]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[/user@::1]" 'hop) nil))

	  ;; Expand `tramp-default-method', `tramp-default-user' and
	  ;; `tramp-default-host'.
	  (should (string-equal
		   (file-remote-p "/[-/]")
		   (format
		    "/[%s/%s@%s]"
		    "default-method" "default-user" "default-host")))
	  (should (string-equal
		   (file-remote-p "/[-/]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[-/]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[-/]" 'host) "default-host"))
	  (should (string-equal (file-remote-p "/[-/]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/]" 'hop) nil))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (let ((tramp-default-host "::1"))
	    (should (string-equal
		     (file-remote-p "/[-/]")
		     (format
		      "/[%s/%s@%s]"
		      "default-method" "default-user" "::1")))
	    (should (string-equal
		     (file-remote-p "/[-/]" 'method) "default-method"))
	    (should (string-equal (file-remote-p "/[-/]" 'user) "default-user"))
	    (should (string-equal (file-remote-p "/[-/]" 'host) "::1"))
	    (should (string-equal (file-remote-p "/[-/]" 'localname) ""))
	    (should (string-equal (file-remote-p "/[-/]" 'hop) nil)))

	  ;; Expand `tramp-default-method' and `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[-/::1]")
		   (format
		    "/[%s/%s@%s]" "default-method" "default-user" "::1")))
	  (should (string-equal
		   (file-remote-p "/[-/::1]" 'method) "default-method"))
	  (should (string-equal
		   (file-remote-p "/[-/::1]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[-/::1]" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[-/::1]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/::1]" 'hop) nil))

	  ;; Expand `tramp-default-method'.
	  (should (string-equal
		   (file-remote-p "/[-/user@::1]")
		   (format "/[%s/%s@%s]" "default-method" "user" "::1")))
	  (should (string-equal
		   (file-remote-p "/[-/user@::1]" 'method) "default-method"))
	  (should (string-equal (file-remote-p "/[-/user@::1]" 'user) "user"))
	  (should (string-equal (file-remote-p "/[-/user@::1]" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[-/user@::1]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[-/user@::1]" 'hop) nil))

	  ;; Expand `tramp-default-user'.
	  (should (string-equal
		   (file-remote-p "/[method/::1]")
		   (format "/[%s/%s@%s]" "method" "default-user" "::1")))
	  (should (string-equal
		   (file-remote-p "/[method/::1]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/::1]" 'user) "default-user"))
	  (should (string-equal (file-remote-p "/[method/::1]" 'host) "::1"))
	  (should (string-equal (file-remote-p "/[method/::1]" 'localname) ""))
	  (should (string-equal (file-remote-p "/[method/::1]" 'hop) nil))

	  ;; No expansion.  Hop.
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]")
		   (format "/[%s/%s@%s#%s]" "method" "user" "::1" "1234")))
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]" 'method) "method"))
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]" 'user) "user"))
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]" 'host) "::1#1234"))
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]" 'localname) ""))
	  (should (string-equal
		   (file-remote-p "/[method/user@::1#1234]" 'hop) nil))

	  ;; Local file name part.
	  (should (string-equal (file-remote-p "/[/host]/:" 'localname) "/:"))
	  (should (string-equal (file-remote-p "/[-/host]/:" 'localname) "/:"))
	  (should (string-equal (file-remote-p "/[method/]:" 'localname) ":"))
	  (should (string-equal (file-remote-p "/[method/] " 'localname) " "))
	  (should (string-equal
		   (file-remote-p "/[method/]file" 'localname) "file"))
	  (should (string-equal
		   (file-remote-p "/[method/]/path/to/file" 'localname)
		   "/path/to/file"))

	  ;; Multihop.
	  (dolist (tramp-show-ad-hoc-proxies '(nil t))

	    ;; Explicit settings in `tramp-default-proxies-alist'
	    ;; shouldn't show hops.
	    (setq tramp-default-proxies-alist
		  '(("^host2$" "^user2$" "/[method1/user1@host1]")))
	    (should
	     (string-equal
	      (file-remote-p "/[method2/user2@host2]/path/to/file")
	      "/[method2/user2@host2]"))
	    (setq tramp-default-proxies-alist nil)

	    ;; Ad-hoc settings.
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file")
	      (if tramp-show-ad-hoc-proxies
		  "/[method1/user1@host1|method2/user2@host2]"
		"/[method2/user2@host2]")))
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file" 'method)
	      "method2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file" 'user)
	      "user2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file" 'host)
	      "host2"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file"
	       'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       "/[method1/user1@host1|method2/user2@host2]/path/to/file" 'hop)
	      (format "%s/%s@%s|"
		      "method1" "user1" "host1")))

	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user1@host1"
		   "|method2/user2@host2"
		   "|method3/user3@host3]")
		"/[method3/user3@host3]")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file")
	       'method)
	      "method3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file")
	       'user)
	      "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file")
	       'host)
	      "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file")
	       'localname)
	      "/path/to/file"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@host2"
		"|method3/user3@host3]/path/to/file")
	       'hop)
	      (format "%s/%s@%s|%s/%s@%s|"
		      "method1" "user1" "host1" "method2" "user2" "host2")))

	    ;; Expand `tramp-default-method-alist'.
	    (add-to-list
	     'tramp-default-method-alist '("host1" "user1" "method1"))
	    (add-to-list
	     'tramp-default-method-alist '("host2" "user2" "method2"))
	    (add-to-list
	     'tramp-default-method-alist '("host3" "user3" "method3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[/user1@host1"
		"|/user2@host2"
		"|/user3@host3]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user1@host1"
		   "|method2/user2@host2"
		   "|method3/user3@host3]")
		"/[method3/user3@host3]")))

	    ;; Expand `tramp-default-user-alist'.
	    (add-to-list 'tramp-default-user-alist '("method1" "host1" "user1"))
	    (add-to-list 'tramp-default-user-alist '("method2" "host2" "user2"))
	    (add-to-list 'tramp-default-user-alist '("method3" "host3" "user3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/host1"
		"|method2/host2"
		"|method3/host3]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user1@host1"
		   "|method2/user2@host2"
		   "|method3/user3@host3]")
		"/[method3/user3@host3]")))

	    ;; Expand `tramp-default-host-alist'.
	    (add-to-list 'tramp-default-host-alist '("method1" "user1" "host1"))
	    (add-to-list 'tramp-default-host-alist '("method2" "user2" "host2"))
	    (add-to-list 'tramp-default-host-alist '("method3" "user3" "host3"))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@"
		"|method2/user2@"
		"|method3/user3@]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user1@host1"
		   "|method2/user2@host2"
		   "|method3/user3@host3]")
		"/[method3/user3@host3]")))

	    ;; Ad-hoc user name and host name expansion.
	    (setq tramp-default-method-alist nil
		  tramp-default-user-alist nil
		  tramp-default-host-alist nil)
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/user1@host1"
		"|method2/user2@"
		"|method3/user3@]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user1@host1"
		   "|method2/user2@host1"
		   "|method3/user3@host1]")
		"/[method3/user3@host1]")))
	    (should
	     (string-equal
	      (file-remote-p
	       (concat
		"/[method1/%u@%h"
		"|method2/user2@host2"
		"|method3/%u@%h"
		"|method4/user4%domain4@host4#1234]/path/to/file"))
	      (if tramp-show-ad-hoc-proxies
		  (concat
		   "/[method1/user2@host2"
		   "|method2/user2@host2"
		   "|method3/user4@host4"
		   "|method4/user4%domain4@host4#1234]")
		"/[method4/user4%domain4@host4#1234]")))))

      ;; Exit.
      (tramp-change-syntax syntax))))

(ert-deftest tramp-test03-file-name-defaults ()
  "Check default values for some methods."
  (skip-unless (eq tramp-syntax 'default))

  ;; Default values in tramp-adb.el.
  (when (assoc "adb" tramp-methods)
    (should (string-equal (file-remote-p "/adb::" 'host) "")))
  ;; Default values in tramp-ftp.el.
  (when (assoc "ftp" tramp-methods)
    (should (string-equal (file-remote-p "/-:ftp.host:" 'method) "ftp"))
    (dolist (u '("ftp" "anonymous"))
      (should
       (string-equal (file-remote-p (format "/-:%s@:" u) 'method) "ftp"))))
  ;; Default values in tramp-sh.el and tramp-sudoedit.el.
  (when (assoc "su" tramp-methods)
    (dolist
	(h `("127.0.0.1" "[::1]" "localhost" "localhost4" "localhost6"
	     "ip6-localhost" "ip6-loopback" ,(system-name)))
      (should
       (string-equal (file-remote-p (format "/-:root@%s:" h) 'method) "su"))))
  (dolist (m '("su" "sudo" "ksu" "doas" "sudoedit"))
    (when (assoc m tramp-methods)
      (should (string-equal (file-remote-p (format "/%s::" m) 'user) "root"))
      (should
       (string-equal (file-remote-p (format "/%s::" m) 'host) (system-name)))))
  (dolist (m '("rcp" "remcp" "rsh" "telnet" "krlogin" "fcp" "nc"))
    (when (assoc m tramp-methods)
      (should
       (string-equal
	(file-remote-p (format "/%s::" m) 'user) (user-login-name)))))
  ;; Default values in tramp-smb.el.
  (when (assoc "smb" tramp-methods)
    (should (string-equal (file-remote-p "/smb::" 'user) nil))))

;; The following test is inspired by Bug#30946.
(ert-deftest tramp-test03-file-name-host-rules ()
  "Check host name rules for host-less methods."
  (skip-unless (eq tramp-syntax 'default))
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))

  ;; Host names must match rules in case the command template of a
  ;; method doesn't use them.
  (dolist (m '("su" "sg" "sudo" "doas" "ksu"))
    (when (assoc m tramp-methods)
      (let (tramp-connection-properties tramp-default-proxies-alist)
	(ignore-errors
	  (tramp-cleanup-connection tramp-test-vec nil 'keep-password))
	;; Single hop.  The host name must match `tramp-local-host-regexp'.
	(should-error
	 (find-file (format "/%s:foo:" m))
	 :type 'user-error)
	;; Multi hop.  The host name must match the previous hop.
	(should-error
	 (find-file
	  (format
	   "%s|%s:foo:"
	   (substring (file-remote-p ert-remote-temporary-file-directory) 0 -1)
	   m))
	 :type 'user-error)))))

(ert-deftest tramp-test03-file-name-method-rules ()
  "Check file name rules for some methods."
  (skip-unless (eq tramp-syntax 'default))
  (skip-unless (tramp--test-enabled))

  ;; Multi hops are allowed for inline methods only.
  (let (non-essential)
    (should-error
     (expand-file-name "/ssh:user1@host1|method:user2@host2:/path/to/file")
     :type 'user-error)
    (should-error
     (expand-file-name "/method:user1@host1|ssh:user2@host2:/path/to/file")
     :type 'user-error)))

(ert-deftest tramp-test04-substitute-in-file-name ()
  "Check `substitute-in-file-name'."
  (skip-unless (eq tramp-syntax 'default))

  ;; Suppress method name check.  We cannot use the string "foo" as
  ;; user name, because (substitute-in-string "/~foo") returns
  ;; different values depending on the existence of user "foo" (see
  ;; Bug#43052).
  (let ((tramp-methods (cons '("method") tramp-methods))
        (foo (downcase (md5 (current-time-string)))))
    (should
     (string-equal (substitute-in-file-name "/method:host:///foo") "/foo"))
    (should
     (string-equal
      (substitute-in-file-name "/method:host://foo") "/method:host:/foo"))
    (should
     (string-equal (substitute-in-file-name "/method:host:/path///foo") "/foo"))
    (should
     (string-equal
      (substitute-in-file-name "/method:host:/path//foo") "/method:host:/foo"))
    ;; Quoting local part.
    (should
     (string-equal
      (substitute-in-file-name "/method:host:/:///foo")
      "/method:host:/:///foo"))
    (should
     (string-equal
      (substitute-in-file-name "/method:host:/://foo") "/method:host:/://foo"))
    (should
     (string-equal
      (substitute-in-file-name "/method:host:/:/path///foo")
      "/method:host:/:/path///foo"))
    (should
     (string-equal
      (substitute-in-file-name "/method:host:/:/path//foo")
      "/method:host:/:/path//foo"))

    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host://~" foo))
      (concat "/~" foo)))
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/~" foo))
      (concat "/method:host:/~" foo)))
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/path//~" foo))
      (concat "/~" foo)))
    ;; (substitute-in-file-name "/path/~foo") expands only for a local
    ;; user "foo" to "/~foo"".  Otherwise, it doesn't expand.
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/path/~" foo))
      (concat "/method:host:/path/~" foo)))
    ;; Quoting local part.
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/://~" foo))
      (concat "/method:host:/://~" foo)))
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/:/~" foo))
      (concat "/method:host:/:/~" foo)))
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/:/path//~" foo))
      (concat "/method:host:/:/path//~" foo)))
    (should
     (string-equal
      (substitute-in-file-name (concat "/method:host:/:/path/~" foo))
      (concat "/method:host:/:/path/~" foo)))

    (let (process-environment)
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/path/$FOO")
	"/method:host:/path/$FOO"))
      (setenv "FOO" "bla")
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/path/$FOO")
	"/method:host:/path/bla"))
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/path/$$FOO")
	"/method:host:/path/$FOO"))
      ;; Quoting local part.
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/:/path/$FOO")
	"/method:host:/:/path/$FOO"))
      (setenv "FOO" "bla")
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/:/path/$FOO")
	"/method:host:/:/path/$FOO"))
      (should
       (string-equal
	(substitute-in-file-name "/method:host:/:/path/$$FOO")
	"/method:host:/:/path/$$FOO")))))

(ert-deftest tramp-test05-expand-file-name ()
  "Check `expand-file-name'."
  (skip-unless (eq tramp-syntax 'default))

  ;; Suppress method name check.
  (let ((tramp-methods (cons '("method") tramp-methods)))
    (should
     (string-equal
      (expand-file-name "/method:host:/path/./file") "/method:host:/path/file"))
    (should
     (string-equal
      (expand-file-name "/method:host:/path/../file") "/method:host:/file"))
    (should
     (string-equal
      (expand-file-name "/method:host:/path/.") "/method:host:/path"))
    (should
     (string-equal
      (expand-file-name "/method:host:/path/..") "/method:host:/"))
    (should
     (string-equal
      (expand-file-name "." "/method:host:/path/") "/method:host:/path"))
    (should
     (string-equal
      (expand-file-name "" "/method:host:/path/") "/method:host:/path"))
    ;; Quoting local part.
    (should
     (string-equal
      (expand-file-name "/method:host:/:/path/./file")
      "/method:host:/:/path/file"))
    (should
     (string-equal
      (expand-file-name "/method:host:/:/path/../file") "/method:host:/:/file"))
    (should
     (string-equal
      (expand-file-name "/method:host:/:/~/path/./file")
      "/method:host:/:/~/path/file"))))

;; The following test is inspired by Bug#26911 and Bug#34834.  They
;; were bugs in `expand-file-name'.
(ert-deftest tramp-test05-expand-file-name-relative ()
  "Check `expand-file-name'."
  (skip-unless (tramp--test-enabled))
  ;; Methods with a share do not expand "/path/..".
  (skip-unless (not (tramp--test-share-p)))
  ;; The bugs are fixed in Emacs 28.1.
  (skip-unless (tramp--test-emacs28-p))

  (should
   (string-equal
    (let ((default-directory
	    (concat
	     (file-remote-p ert-remote-temporary-file-directory) "/path")))
      (expand-file-name ".." "./"))
    (concat (file-remote-p ert-remote-temporary-file-directory) "/"))))

(ert-deftest tramp-test05-expand-file-name-top ()
  "Check `expand-file-name'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))

  (let ((dir (concat (file-remote-p ert-remote-temporary-file-directory) "/")))
    (dolist (local '("." ".."))
      (should (string-equal (expand-file-name local dir) dir))
      (should (string-equal (expand-file-name (concat dir local)) dir)))))

;; The following test is inspired by Bug#65685.
(ert-deftest tramp-test05-expand-file-name-tilde ()
  "Check `expand-file-name'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))

  (let ((dir (file-remote-p ert-remote-temporary-file-directory))
	(tramp-tolerate-tilde t))
    (should (string-equal (expand-file-name (concat dir "~"))
			  (expand-file-name (concat dir "/:~"))))))

(ert-deftest tramp-test06-directory-file-name ()
  "Check `directory-file-name'.
This checks also `file-name-as-directory', `file-name-directory',
`file-name-nondirectory' and `unhandled-file-name-directory'."
  (skip-unless (eq tramp-syntax 'default))

  ;; Suppress method name check.
  (let ((tramp-methods (cons '("method") tramp-methods)))
    (should
     (string-equal
      (directory-file-name "/method:host:/path/to/file")
      "/method:host:/path/to/file"))
    (should
     (string-equal
      (directory-file-name "/method:host:/path/to/file/")
      "/method:host:/path/to/file"))
    (should
     (string-equal
      (directory-file-name "/method:host:/path/to/file//")
      "/method:host:/path/to/file"))
    (should
     (string-equal
      (file-name-as-directory "/method:host:/path/to/file")
      "/method:host:/path/to/file/"))
    (should
     (string-equal
      (file-name-as-directory "/method:host:/path/to/file/")
      "/method:host:/path/to/file/"))
    (should
     (string-equal
      (file-name-directory "/method:host:/path/to/file")
      "/method:host:/path/to/"))
    (should
     (string-equal
      (file-name-directory "/method:host:/path/to/file/")
      "/method:host:/path/to/file/"))
    (should
     (string-equal (file-name-directory "/method:host:file") "/method:host:"))
    (should
     (string-equal
      (file-name-directory "/method:host:path/") "/method:host:path/"))
    (should
     (string-equal
      (file-name-directory "/method:host:path/to") "/method:host:path/"))
    (should
     (string-equal
      (file-name-nondirectory "/method:host:/path/to/file") "file"))
    (should
     (string-equal (file-name-nondirectory "/method:host:/path/to/file/") ""))
    (should-not
     (unhandled-file-name-directory "/method:host:/path/to/file")))

  ;; Bug#10085.
  (when (tramp--test-enabled) ;; Packages like tramp-gvfs.el might be disabled.
    (dolist (non-essential '(nil t))
      ;; We must clear `tramp-default-method'.  On hydra, it is "ftp",
      ;; which ruins the tests.
      (let ((tramp-default-method
	     (file-remote-p ert-remote-temporary-file-directory 'method))
	    (host-port
	     (file-remote-p ert-remote-temporary-file-directory 'host)))
	(dolist
	    (file
	     `(,(format "/%s::" tramp-default-method)
	       ,(format
		 "/-:%s:"
		 ;; `(file-remote-p ... 'host)' eliminates IPv6
		 ;; delimiters.  Add them.
		 (if (string-match tramp-ipv6-regexp host-port)
		     (replace-match
		      (format
		       "%s\\&%s"
		       tramp-prefix-ipv6-format tramp-postfix-ipv6-format)
		      nil nil host-port)
		   host-port))))
	  (should (string-equal (directory-file-name file) file))
	  (should
	   (string-equal
	    (file-name-as-directory file)
	    (if non-essential
		file (concat file (if (tramp--test-ange-ftp-p) "/" "./")))))
	  (should (string-equal (file-name-directory file) file))
	  (should (string-equal (file-name-nondirectory file) "")))))))

(ert-deftest tramp-test07-abbreviate-file-name ()
  "Check that Tramp abbreviates file names correctly."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))
  ;; `abbreviate-file-name' is supported since Emacs 29.1.
  (skip-unless (tramp--test-emacs29-p))

  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (let* ((remote-host (file-remote-p ert-remote-temporary-file-directory))
	 (remote-host-nohop
	  (tramp-make-tramp-file-name (tramp-dissect-file-name remote-host)))
	 ;; Not all methods can expand "~".
         (home-dir (ignore-errors (expand-file-name (concat remote-host "~"))))
	 home-dir-nohop)
    (skip-unless home-dir)

    ;; Check home-dir abbreviation.
    (unless (string-suffix-p "~" home-dir)
      (should (equal (abbreviate-file-name (concat home-dir "/foo/bar"))
                     (concat remote-host-nohop "~/foo/bar")))
      (should (equal (abbreviate-file-name
		      (concat remote-host "/nowhere/special"))
                     (concat remote-host-nohop "/nowhere/special"))))

    ;; Check `directory-abbrev-alist' abbreviation.
    (let ((directory-abbrev-alist
           `((,(rx bos (literal home-dir) "/foo") . ,(concat home-dir "/f"))
             (,(rx bos (literal remote-host) "/nowhere")
	      . ,(concat remote-host "/nw")))))
      (should (equal (abbreviate-file-name (concat home-dir "/foo/bar"))
                     (concat remote-host-nohop "~/f/bar")))
      (should (equal (abbreviate-file-name
		      (concat remote-host "/nowhere/special"))
                     (concat remote-host-nohop "/nw/special"))))

    ;; Check that home-dir abbreviation doesn't occur when home-dir is just "/".
    (setq home-dir (concat remote-host "/")
	  home-dir-nohop
	  (tramp-make-tramp-file-name (tramp-dissect-file-name home-dir)))
    ;; The remote home directory is kept in the connection property "~".
    ;; We fake this setting.
    (tramp-set-connection-property tramp-test-vec "~" (file-local-name home-dir))
    (should (equal (abbreviate-file-name (concat home-dir "foo/bar"))
		   (concat home-dir-nohop "foo/bar")))
    (tramp-flush-connection-property tramp-test-vec "~")))

(ert-deftest tramp-test07-file-exists-p ()
  "Check `file-exist-p', `write-region' and `delete-file'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted)))
      (should-not (file-exists-p tmp-name))
      (write-region "foo" nil tmp-name)
      (should (file-exists-p tmp-name))
      (delete-file tmp-name)
      (should-not (file-exists-p tmp-name))

      ;; Trashing files doesn't work when `system-move-file-to-trash'
      ;; is defined (on MS-Windows and macOS), and for encrypted
      ;; remote files.
      (unless (or (fboundp 'system-move-file-to-trash) (tramp--test-crypt-p))
	(let ((trash-directory (tramp--test-make-temp-name 'local quoted))
	      (delete-by-moving-to-trash t))
	  (make-directory trash-directory)
	  (should-not (file-exists-p tmp-name))
	  (write-region "foo" nil tmp-name)
	  (should (file-exists-p tmp-name))
	  (delete-file tmp-name 'trash)
	  (should-not (file-exists-p tmp-name))
	  (should
	   (or (file-exists-p
		(expand-file-name
		 (file-name-nondirectory tmp-name) trash-directory))
	       ;; Gdrive.
	       (file-symlink-p
		(expand-file-name
		 (file-name-nondirectory tmp-name) trash-directory))))
	  (delete-directory trash-directory 'recursive)
	  (should-not (file-exists-p trash-directory))))

      ;; Setting `remote-file-name-inhibit-delete-by-moving-to-trash'
      ;; prevents trashing remote files.
      (let ((trash-directory (tramp--test-make-temp-name 'local quoted))
	    (delete-by-moving-to-trash t)
	    (remote-file-name-inhibit-delete-by-moving-to-trash t))
	(make-directory trash-directory)
	(should-not (file-exists-p tmp-name))
	(write-region "foo" nil tmp-name)
	(should (file-exists-p tmp-name))
	(delete-file tmp-name 'trash)
	(should-not (file-exists-p tmp-name))
	(should-not
	 (file-exists-p
	  (expand-file-name (file-name-nondirectory tmp-name) trash-directory)))
	(delete-directory trash-directory 'recursive)
	(should-not (file-exists-p trash-directory))))))

(ert-deftest tramp-test08-file-local-copy ()
  "Check `file-local-copy'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  tmp-name2)
      (unwind-protect
	  (progn
	    (write-region "foo" nil tmp-name1)
	    (should (setq tmp-name2 (file-local-copy tmp-name1)))
	    (with-temp-buffer
	      (insert-file-contents tmp-name2)
	      (should (string-equal (buffer-string) "foo")))
	    ;; Check also that a file transfer with compression works.
	    (let ((default-directory ert-remote-temporary-file-directory)
		  (tramp-copy-size-limit 4)
		  (tramp-inline-compress-start-size 2))
	      (delete-file tmp-name2)
	      (should (setq tmp-name2 (file-local-copy tmp-name1))))
	    ;; Error case.
	    (delete-file tmp-name1)
	    (delete-file tmp-name2)
	    (should-error
	     (setq tmp-name2 (file-local-copy tmp-name1))
	     :type 'file-missing))

	;; Cleanup.
	(ignore-errors
	  (delete-file tmp-name1)
	  (delete-file tmp-name2))))))

(ert-deftest tramp-test09-insert-file-contents ()
  "Check `insert-file-contents'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted)))
      (unwind-protect
	  (with-temp-buffer
	    (write-region "foo" nil tmp-name)
	    (let ((point (point)))
	      (should
	       (equal
		(insert-file-contents tmp-name)
		`(,(expand-file-name tmp-name) 3)))
	      (should (string-equal (buffer-string) "foo"))
	      (should (= point (point))))
	    (goto-char (1+ (point)))
	    (let ((point (point)))
	      (should
	       (equal
		(insert-file-contents tmp-name)
		`(,(expand-file-name tmp-name) 3)))
	      (should (string-equal (buffer-string) "ffoooo"))
	      (should (= point (point))))
	    ;; Insert partly.
	    (let ((point (point)))
	      (should
	       (equal
		(insert-file-contents tmp-name nil 1 3)
		`(,(expand-file-name tmp-name) 2)))
	      (should (string-equal (buffer-string) "foofoooo"))
	      (should (= point (point))))
	    (let ((point (point)))
	      (should
	       (equal
		(insert-file-contents tmp-name nil 2 5)
		`(,(expand-file-name tmp-name) 1)))
	      (should (string-equal (buffer-string) "fooofoooo"))
	      (should (= point (point))))
	    ;; Replace.
	    (let ((point (point)))
	      ;; 0 characters replaced, because "foo" is already there.
	      (should
	       (equal
		(insert-file-contents tmp-name nil nil nil 'replace)
		`(,(expand-file-name tmp-name) 0)))
	      (should (string-equal (buffer-string) "foo"))
	      (should (= point (point))))
	    ;; Insert another string.
	    ;; `replace-string-in-region' was introduced in Emacs 28.1.
	    (when (tramp--test-emacs28-p)
	      (let ((point (point)))
		(with-no-warnings
		  (replace-string-in-region "foo" "bar" (point-min) (point-max)))
		(goto-char point)
		(should
		 (equal
		  (insert-file-contents tmp-name nil nil nil 'replace)
		  `(,(expand-file-name tmp-name) 3)))
		(should (string-equal (buffer-string) "foo"))
		(should (= point (point)))))
	    ;; Error case.
	    (delete-file tmp-name)
	    (should-error
	     (insert-file-contents tmp-name)
	     :type 'file-missing))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name))))))

(ert-deftest tramp-test10-write-region ()
  "Check `write-region'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted))
          (inhibit-message t))
      (unwind-protect
	  (progn
            ;; Write buffer.  Use absolute and relative file name.
	    (with-temp-buffer
	      (insert "foo")
	      (write-region nil nil tmp-name))
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (string-equal (buffer-string) "foo")))
	    (delete-file tmp-name)
	    (with-temp-buffer
	      (insert "foo")
	      (should-not (file-exists-p tmp-name))
	      (let ((default-directory (file-name-directory tmp-name)))
		(should-not (file-exists-p (file-name-nondirectory tmp-name)))
		(write-region nil nil (file-name-nondirectory tmp-name))
		(should (file-exists-p (file-name-nondirectory tmp-name))))
	      (should (file-exists-p tmp-name)))
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (string-equal (buffer-string) "foo")))

	    ;; Append.
	    (unless (tramp--test-ange-ftp-p)
	      (with-temp-buffer
		(insert "bla")
		(write-region nil nil tmp-name 'append))
	      (with-temp-buffer
		(insert-file-contents tmp-name)
		(should (string-equal (buffer-string) "foobla")))
	      (with-temp-buffer
		(insert "baz")
		(write-region nil nil tmp-name 3))
	      (with-temp-buffer
		(insert-file-contents tmp-name)
		(should (string-equal (buffer-string) "foobaz")))
	      (delete-file tmp-name)
	      (with-temp-buffer
		(insert "foo")
		(write-region nil nil tmp-name 'append))
	      (with-temp-buffer
		(insert-file-contents tmp-name)
		(should (string-equal (buffer-string) "foo"))))

	    ;; Write string.
	    (write-region "foo" nil tmp-name)
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (string-equal (buffer-string) "foo")))

	    ;; Write empty string.  Used for creation of temporary files.
	    (should-error
	     (make-empty-file tmp-name)
	     :type 'file-already-exists)
	    (delete-file tmp-name)
	    (make-empty-file tmp-name)
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (string-equal (buffer-string) "")))

	    ;; Write partly.
	    (with-temp-buffer
	      (insert "123456789")
	      (write-region 3 5 tmp-name))
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (string-equal (buffer-string) "34")))

	    ;; Check message.
	    (let (inhibit-message)
	      (dolist (noninteractive (unless (tramp--test-ange-ftp-p) '(nil t)))
		(dolist (visit '(nil t "string" no-message))
		  (ert-with-message-capture tramp--test-messages
		    (write-region "foo" nil tmp-name nil visit)
		    ;; We must check the last line.  There could be
		    ;; other messages from the progress reporter.
		    (should
		     (string-match-p
		      (if (and (null noninteractive)
			       (or (eq visit t) (null visit) (stringp visit)))
			  (rx bol "Wrote " (literal tmp-name) "\n" eos)
			(rx bos))
		      tramp--test-messages))))))

	    ;; We do not test the lock file here.  See
	    ;; `tramp-test39-make-lock-file-name'.

	    ;; Do not overwrite if excluded.
	    (cl-letf (((symbol-function #'y-or-n-p) #'tramp-compat-always)
		      ;; Ange-FTP.
		      ((symbol-function #'yes-or-no-p) #'tramp-compat-always))
	      (write-region "foo" nil tmp-name nil nil nil 'mustbenew))
	    (should-error
	     (cl-letf (((symbol-function #'y-or-n-p) #'ignore)
		       ;; Ange-FTP.
		       ((symbol-function #'yes-or-no-p) #'ignore))
	       (write-region "foo" nil tmp-name nil nil nil 'mustbenew))
             :type 'file-already-exists)
	    (should-error
	     (write-region "foo" nil tmp-name nil nil nil 'excl)
	     :type 'file-already-exists)
	    (delete-file tmp-name)

	    ;; Check `buffer-file-coding-system'.  Bug#65022.
	    (with-temp-buffer
	      (setq buffer-file-name tmp-name)
	      (insert "foo")
	      (set-buffer-file-coding-system 'cp1251)
	      (let ((bfcs buffer-file-coding-system))
		(should (buffer-modified-p))
		(should (null (save-buffer)))
		(should
                 (eq (coding-system-get buffer-file-coding-system :mime-charset)
                     (coding-system-get bfcs :mime-charset))))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name))))))

;; The following test is inspired by Bug#35497.
(ert-deftest tramp-test10-write-region-file-precious-flag ()
  "Check that `file-precious-flag' is respected with Tramp in use."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))

  (let* ((tmp-name (tramp--test-make-temp-name))
         (inhibit-message t)
         written-files
         (advice (lambda (_start _end filename &rest _r)
                   (push filename written-files))))

    (unwind-protect
        (with-current-buffer (find-file-noselect tmp-name)
          ;; Write initial contents.  Adapt `visited-file-modtime'
          ;; in order to suppress confirmation.
          (insert "foo")
          (write-region nil nil tmp-name)
          (set-visited-file-modtime)
          ;; Run the test.
          (advice-add 'write-region :before advice)
          (setq-local file-precious-flag t)
          (setq-local backup-inhibited t)
          (insert "bar")
	  (should (buffer-modified-p))
          (should (null (save-buffer)))
	  (should (not (buffer-modified-p)))
          (should-not (cl-member tmp-name written-files :test #'string=)))

      ;; Cleanup.
      (ignore-errors (advice-remove 'write-region advice))
      (ignore-errors (delete-file tmp-name)))))

;; The following test is inspired by Bug#55166.
(ert-deftest tramp-test10-write-region-other-file-name-handler ()
  "Check that another file name handler in VISIT is acknowledged."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))
  (skip-unless (executable-find "gzip"))
  ;; The function was introduced in Emacs 28.1.
  (skip-unless (boundp 'tar-goto-file))

  (let* ((default-directory ert-remote-temporary-file-directory)
	 (archive (ert-resource-file "foo.tar.gz"))
	 (tmp-file (expand-file-name (file-name-nondirectory archive)))
	 (require-final-newline t)
	 (inhibit-message t)
         (backup-inhibited t)
	 create-lockfiles buffer1 buffer2)
    (unwind-protect
	(progn
	  (copy-file archive tmp-file 'ok)
	  ;; Read archive.  Check contents of foo.txt, and modify it.  Save.
	  (with-current-buffer (setq buffer1 (find-file-noselect tmp-file))
	    ;; The function was introduced in Emacs 28.1.
	    (with-no-warnings (should (tar-goto-file "foo.txt")))
	    (save-current-buffer
	      (setq buffer2 (tar-extract))
	      (should (string-equal (buffer-string) "foo\n"))
	      (goto-char (point-max))
	      (insert "bar")
	      (should (buffer-modified-p))
              (should (null (save-buffer)))
	      (should-not (buffer-modified-p)))
	    (should (buffer-modified-p))
            (should (null (save-buffer)))
	    (should-not (buffer-modified-p)))

	  (kill-buffer buffer1)
	  (kill-buffer buffer2)
	  ;; Read archive.  Check contents of modified foo.txt.
	  (with-current-buffer (setq buffer1 (find-file-noselect tmp-file))
	    ;; The function was introduced in Emacs 28.1.
	    (with-no-warnings (should (tar-goto-file "foo.txt")))
	    (save-current-buffer
	      (setq buffer2 (tar-extract))
	      (should (string-equal (buffer-string) "foo\nbar\n")))))

      ;; Cleanup.
      (ignore-errors (kill-buffer buffer1))
      (ignore-errors (kill-buffer buffer2))
      (ignore-errors (delete-file tmp-file)))))

(ert-deftest tramp-test11-copy-file ()
  "Check `copy-file'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (tmp-name3 (tramp--test-make-temp-name 'local quoted)))
      (dolist (source-target
	       `(;; Copy on remote side.
		 (,tmp-name1 . ,tmp-name2)
		 ;; Copy from remote side to local side.
		 (,tmp-name1 . ,tmp-name3)
		 ;; Copy from local side to remote side.
		 (,tmp-name3 . ,tmp-name1)))
	(let ((source (car source-target))
	      (target (cdr source-target)))

	  ;; Copy simple file.
	  (unwind-protect
	      (progn
		(should-error
		 (copy-file source target)
		 :type 'file-missing)
		(write-region "foo" nil source)
		(should (file-exists-p source))
		(copy-file source target)
		(should (file-exists-p target))
		(with-temp-buffer
		  (insert-file-contents target)
		  (should (string-equal (buffer-string) "foo")))
		(when (tramp--test-expensive-test-p)
		  (should-error
		   (copy-file source target)
		   :type 'file-already-exists))
		(copy-file source target 'ok))

	    ;; Cleanup.
	    (ignore-errors (delete-file source))
	    (ignore-errors (delete-file target)))

	  ;; Copy file to directory.
	  (unwind-protect
	      ;; This doesn't work on FTP.
	      (unless (tramp--test-ange-ftp-p)
		(write-region "foo" nil source)
		(should (file-exists-p source))
		(make-directory target)
		(should (file-directory-p target))
		(when (tramp--test-expensive-test-p)
		  (should-error
		   (copy-file source target)
		   :type 'file-already-exists)
		  (should-error
		   (copy-file source target 'ok)
		   :type 'file-error))
		(copy-file source (file-name-as-directory target))
		(should
		 (file-exists-p
		  (expand-file-name (file-name-nondirectory source) target))))

	    ;; Cleanup.
	    (ignore-errors (delete-file source))
	    (ignore-errors (delete-directory target 'recursive)))

	  ;; Copy directory to existing directory.
	  (unwind-protect
	      ;; This doesn't work on FTP.
	      (unless (tramp--test-ange-ftp-p)
		(make-directory source)
		(should (file-directory-p source))
		(write-region "foo" nil (expand-file-name "foo" source))
		(should (file-exists-p (expand-file-name "foo" source)))
		(make-directory target)
		(should (file-directory-p target))
		;; Directory `target' exists already, so we must use
		;; `file-name-as-directory'.
		(copy-file source (file-name-as-directory target))
		(should
		 (file-exists-p
		  (expand-file-name
		   (concat (file-name-nondirectory source) "/foo") target))))

	    ;; Cleanup.
	    (ignore-errors (delete-directory source 'recursive))
	    (ignore-errors (delete-directory target 'recursive)))

	  ;; Copy directory/file to non-existing directory.
	  (unwind-protect
	      ;; This doesn't work on FTP.
	      (unless (tramp--test-ange-ftp-p)
		(make-directory source)
		(should (file-directory-p source))
		(write-region "foo" nil (expand-file-name "foo" source))
		(should (file-exists-p (expand-file-name "foo" source)))
		(make-directory target)
		(should (file-directory-p target))
		(copy-file
		 source
		 (expand-file-name (file-name-nondirectory source) target))
		(should
		 (file-exists-p
		  (expand-file-name
		   (concat (file-name-nondirectory source) "/foo") target))))

	    ;; Cleanup.
	    (ignore-errors (delete-directory source 'recursive))
	    (ignore-errors (delete-directory target 'recursive))))))))

(ert-deftest tramp-test12-rename-file ()
  "Check `rename-file'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted  (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (tmp-name3 (tramp--test-make-temp-name 'local quoted)))
      (dolist (source-target
	       `(;; Rename on remote side.
		 (,tmp-name1 . ,tmp-name2)
		 ;; Rename from remote side to local side.
		 (,tmp-name1 . ,tmp-name3)
		 ;; Rename from local side to remote side.
		 (,tmp-name3 . ,tmp-name1)))
	(let ((source (car source-target))
	      (target (cdr source-target)))

	  ;; Rename simple file.
	  (unwind-protect
	      (progn
		(should-error
		 (rename-file source target)
		 :type 'file-missing)
		(write-region "foo" nil source)
		(should (file-exists-p source))
		(rename-file source target)
		(should-not (file-exists-p source))
		(should (file-exists-p target))
		(with-temp-buffer
		  (insert-file-contents target)
		  (should (string-equal (buffer-string) "foo")))
		(write-region "foo" nil source)
		(should (file-exists-p source))
		(when (tramp--test-expensive-test-p)
		  (should-error
		   (rename-file source target)
		   :type 'file-already-exists))
		(rename-file source target 'ok)
		(should-not (file-exists-p source)))

	    ;; Cleanup.
	    (ignore-errors (delete-file source))
	    (ignore-errors (delete-file target)))

	  ;; Rename file to directory.
	  (unwind-protect
	      (progn
		(write-region "foo" nil source)
		(should (file-exists-p source))
		(make-directory target)
		(should (file-directory-p target))
		(when (tramp--test-expensive-test-p)
		  (should-error
		   (rename-file source target)
		   :type 'file-already-exists)
		  (should-error
		   (rename-file source target 'ok)
		   :type 'file-error))
		(rename-file source (file-name-as-directory target))
		(should-not (file-exists-p source))
		(should
		 (file-exists-p
		  (expand-file-name (file-name-nondirectory source) target))))

	    ;; Cleanup.
	    (ignore-errors (delete-file source))
	    (ignore-errors (delete-directory target 'recursive)))

	  ;; Rename directory to existing directory.
	  (unwind-protect
	      ;; This doesn't work on FTP.
	      (unless (tramp--test-ange-ftp-p)
		(make-directory source)
		(should (file-directory-p source))
		(write-region "foo" nil (expand-file-name "foo" source))
		(should (file-exists-p (expand-file-name "foo" source)))
		(make-directory target)
		(should (file-directory-p target))
		;; Directory `target' exists already, so we must use
		;; `file-name-as-directory'.
		(rename-file source (file-name-as-directory target))
		(should-not (file-exists-p source))
		(should
		 (file-exists-p
		  (expand-file-name
		   (concat (file-name-nondirectory source) "/foo") target))))

	    ;; Cleanup.
	    (ignore-errors (delete-directory source 'recursive))
	    (ignore-errors (delete-directory target 'recursive)))

	  ;; Rename directory/file to non-existing directory.
	  (unwind-protect
	      ;; This doesn't work on FTP.
	      (unless (tramp--test-ange-ftp-p)
		(make-directory source)
		(should (file-directory-p source))
		(write-region "foo" nil (expand-file-name "foo" source))
		(should (file-exists-p (expand-file-name "foo" source)))
		(make-directory target)
		(should (file-directory-p target))
		(rename-file
		 source
		 (expand-file-name (file-name-nondirectory source) target))
		(should-not (file-exists-p source))
		(should
		 (file-exists-p
		  (expand-file-name
		   (concat (file-name-nondirectory source) "/foo") target))))

	    ;; Cleanup.
	    (ignore-errors (delete-directory source 'recursive))
	    (ignore-errors (delete-directory target 'recursive))))))))

(ert-deftest tramp-test13-make-directory ()
  "Check `make-directory'.
This tests also `file-directory-p' and `file-accessible-directory-p'."
  (skip-unless (tramp--test-enabled))

  ;; Since Emacs 29.1, `make-directory' has defined return values.
  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "foo/bar" tmp-name1))
	   (unusual-file-mode-1 #o740)
	   (unusual-file-mode-2 #o710))
      (unwind-protect
	  (progn
	    (with-file-modes unusual-file-mode-1
	      (if (tramp--test-emacs29-p)
		  (should-not (make-directory tmp-name1))
		(make-directory tmp-name1)))
	    (should-error
	     (make-directory tmp-name1)
	     :type 'file-already-exists)
	    (should (file-directory-p tmp-name1))
	    (should (file-accessible-directory-p tmp-name1))
	    (when (tramp--test-supports-set-file-modes-p)
	      (should (equal (format "%#o" unusual-file-mode-1)
			     (format "%#o" (file-modes tmp-name1)))))
	    (should-error
	     (make-directory tmp-name2)
	     :type 'file-error)
	    (with-file-modes unusual-file-mode-2
	      (if (tramp--test-emacs29-p)
		  (should-not (make-directory tmp-name2 'parents))
		(make-directory tmp-name2 'parents)))
	    (should (file-directory-p tmp-name2))
	    (should (file-accessible-directory-p tmp-name2))
	    (when (tramp--test-supports-set-file-modes-p)
	      (should (equal (format "%#o" unusual-file-mode-2)
			     (format "%#o" (file-modes tmp-name2)))))
	    ;; If PARENTS is non-nil, `make-directory' shall not
	    ;; signal an error when DIR exists already.  It returns t.
	    (if (tramp--test-emacs29-p)
		(should (make-directory tmp-name2 'parents))
	      (make-directory tmp-name2 'parents)))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(ert-deftest tramp-test14-delete-directory ()
  "Check `delete-directory'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "foo" tmp-name1)))
      ;; Delete empty directory.
      (make-directory tmp-name1)
      (should (file-directory-p tmp-name1))
      (delete-directory tmp-name1)
      (should-not (file-directory-p tmp-name1))
      ;; Delete non-empty directory.
      (make-directory tmp-name1)
      (should (file-directory-p tmp-name1))
      (write-region "foo" nil (expand-file-name "bla" tmp-name1))
      (should (file-exists-p (expand-file-name "bla" tmp-name1)))
      (make-directory tmp-name2)
      (should (file-directory-p tmp-name2))
      (write-region "foo" nil (expand-file-name "bla" tmp-name2))
      (should (file-exists-p (expand-file-name "bla" tmp-name2)))
      (should-error
       (delete-directory tmp-name1)
       :type 'file-error)
      (delete-directory tmp-name1 'recursive)
      (should-not (file-directory-p tmp-name1))

      ;; Trashing directories doesn't work when
      ;; `system-move-file-to-trash' is defined (on MS Windows and
      ;; macOS), for encrypted remote directories and for ange-ftp.
      (when (and (not (fboundp 'system-move-file-to-trash))
		 (not (tramp--test-crypt-p)) (not (tramp--test-ftp-p)))
	(let ((trash-directory (tramp--test-make-temp-name 'local quoted))
	      (delete-by-moving-to-trash t))
	  (make-directory trash-directory)
	  ;; Delete empty directory.
	  (make-directory tmp-name1)
	  (should (file-directory-p tmp-name1))
	  (delete-directory tmp-name1 nil 'trash)
	  (should-not (file-directory-p tmp-name1))
	  (should
	   (file-exists-p
	    (expand-file-name
	     (file-name-nondirectory tmp-name1) trash-directory)))
	  (delete-directory trash-directory 'recursive)
	  (should-not (file-exists-p trash-directory))
	  ;; Delete non-empty directory.
	  (make-directory tmp-name1)
	  (should (file-directory-p tmp-name1))
	  (write-region "foo" nil (expand-file-name "bla" tmp-name1))
	  (should (file-exists-p (expand-file-name "bla" tmp-name1)))
	  (make-directory tmp-name2)
	  (should (file-directory-p tmp-name2))
	  (write-region "foo" nil (expand-file-name "bla" tmp-name2))
	  (should (file-exists-p (expand-file-name "bla" tmp-name2)))
	  (should-error
	   (delete-directory tmp-name1 nil 'trash)
	   ;; tramp-rclone.el and tramp-sshfs.el call the local
	   ;; `delete-directory'.  This raises another error.
	   :type (if (tramp--test-fuse-p) 'error 'file-error))
	  (delete-directory tmp-name1 'recursive 'trash)
	  (should-not (file-directory-p tmp-name1))
	  (should
	   (file-exists-p
	    (format
	     "%s/%s/bla" trash-directory (file-name-nondirectory tmp-name1))))
	  (should
	   (file-exists-p
	    (format
	     "%s/%s/%s/bla" trash-directory (file-name-nondirectory tmp-name1)
	     (file-name-nondirectory tmp-name2))))
	  (delete-directory trash-directory 'recursive)
	  (should-not (file-exists-p trash-directory))))

      ;; Setting `remote-file-name-inhibit-delete-by-moving-to-trash'
      ;; prevents trashing remote files.
      (let ((trash-directory (tramp--test-make-temp-name 'local quoted))
	    (delete-by-moving-to-trash t)
	    (remote-file-name-inhibit-delete-by-moving-to-trash t))
	(make-directory trash-directory)
	(make-directory tmp-name1)
	(should (file-directory-p tmp-name1))
	(delete-directory tmp-name1 nil 'trash)
	(should-not (file-exists-p tmp-name1))
	(should-not
	 (file-exists-p
	  (expand-file-name (file-name-nondirectory tmp-name1) trash-directory)))
	(delete-directory trash-directory 'recursive)
	(should-not (file-exists-p trash-directory))))))

(ert-deftest tramp-test15-copy-directory ()
  "Check `copy-directory'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-rclone-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (tramp--test-make-temp-name nil quoted))
	   (tmp-name3 (expand-file-name
		       (file-name-nondirectory tmp-name1) tmp-name2))
	   (tmp-name4 (expand-file-name "foo" tmp-name1))
	   (tmp-name5 (expand-file-name "foo" tmp-name2))
	   (tmp-name6 (expand-file-name "foo" tmp-name3))
	   (tmp-name7 (tramp--test-make-temp-name nil quoted)))

      ;; Copy complete directory.
      (unwind-protect
	  (progn
	    (should-error
	     (copy-directory tmp-name1 tmp-name2)
	     :type 'file-missing)
	    ;; Copy empty directory.
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name4)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name4))
	    (copy-directory tmp-name1 tmp-name2)
	    (should (file-directory-p tmp-name2))
	    (should (file-exists-p tmp-name5))
	    ;; Target directory does exist already.
	    (should-error
	     (copy-directory tmp-name1 tmp-name2)
	     :type 'file-already-exists)
	    (copy-directory tmp-name1 (file-name-as-directory tmp-name2))
	    (should (file-directory-p tmp-name3))
	    (should (file-exists-p tmp-name6)))

	;; Cleanup.
	(ignore-errors
	  (delete-directory tmp-name1 'recursive)
	  (delete-directory tmp-name2 'recursive)))

      ;; Copy directory contents.
      (unwind-protect
	  (progn
	    ;; Copy empty directory.
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name4)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name4))
	    (copy-directory tmp-name1 tmp-name2 nil 'parents 'contents)
	    (should (file-directory-p tmp-name2))
	    (should (file-exists-p tmp-name5))
	    ;; Target directory does exist already.
	    (delete-file tmp-name5)
	    (should-not (file-exists-p tmp-name5))
	    (copy-directory
	     tmp-name1 (file-name-as-directory tmp-name2)
	     nil 'parents 'contents)
	    (should (file-directory-p tmp-name2))
	    (should (file-exists-p tmp-name5))
	    (should-not (file-directory-p tmp-name3))
	    (should-not (file-exists-p tmp-name6)))

	;; Cleanup.
	(ignore-errors
	  (delete-directory tmp-name1 'recursive)
	  (delete-directory tmp-name2 'recursive)))

      ;; Copy symlink to directory.  Implemented since Emacs 28.1.
      (when (boundp 'copy-directory-create-symlink)
	(dolist (copy-directory-create-symlink '(nil t))
	  (unwind-protect
	      (tramp--test-ignore-make-symbolic-link-error
		;; Copy to file name.
		(make-directory tmp-name1)
		(write-region "foo" nil tmp-name4)
		(make-symbolic-link tmp-name1 tmp-name7)
		(should (file-directory-p tmp-name1))
		(should (file-exists-p tmp-name4))
		(should (file-symlink-p tmp-name7))
		(copy-directory tmp-name7 tmp-name2)
		(if copy-directory-create-symlink
		    (should
		     (string-equal
		      (file-symlink-p tmp-name2) (file-symlink-p tmp-name7)))
		  (should (file-directory-p tmp-name2)))
		;; Copy to directory name.
		(delete-directory tmp-name2 'recursive)
		(make-directory tmp-name2)
		(should (file-directory-p tmp-name2))
		(copy-directory tmp-name7 (file-name-as-directory tmp-name2))
		(if copy-directory-create-symlink
		    (should
		     (string-equal
		      (file-symlink-p
		       (expand-file-name
			(file-name-nondirectory tmp-name7) tmp-name2))
		      (file-symlink-p tmp-name7)))
		  (should
		   (file-directory-p
		    (expand-file-name
		     (file-name-nondirectory tmp-name7) tmp-name2)))))

	    ;; Cleanup.
	    (ignore-errors
	      (delete-directory tmp-name1 'recursive)
	      (delete-directory tmp-name2 'recursive)
	      (delete-directory tmp-name7 'recursive))))))))

(ert-deftest tramp-test16-directory-files ()
  "Check `directory-files'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tramp-fuse-remove-hidden-files t)
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "bla" tmp-name1))
	   (tmp-name3 (expand-file-name "foo" tmp-name1)))
      (unwind-protect
	  (progn
	    (should-error
	     (directory-files tmp-name1)
	     :type 'file-missing)
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name2)
	    (write-region "bla" nil tmp-name3)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name2))
	    (should (file-exists-p tmp-name3))
	    (should (equal (directory-files tmp-name1) '("." ".." "bla" "foo")))
	    (should (equal (directory-files tmp-name1 'full)
			   `(,(concat tmp-name1 "/.")
			     ,(concat tmp-name1 "/..")
			     ,tmp-name2 ,tmp-name3)))
	    (should (equal (directory-files
			    tmp-name1 nil directory-files-no-dot-files-regexp)
			   '("bla" "foo")))
	    (should (equal (directory-files
			    tmp-name1 'full directory-files-no-dot-files-regexp)
			   `(,tmp-name2 ,tmp-name3)))
	    ;; Check the COUNT arg.  It exists since Emacs 28.
	    (when (tramp--test-emacs28-p)
	      (with-no-warnings
		(should
		 (equal
		  (directory-files
		   tmp-name1 nil directory-files-no-dot-files-regexp nil 1)
		  '("bla"))))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

;; This is not a file name handler test.  But Tramp needed to apply an
;; advice for older Emacs versions, so we check that this has been fixed.
(ert-deftest tramp-test16-file-expand-wildcards ()
  "Check `file-expand-wildcards'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tramp-fuse-remove-hidden-files t)
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "foo" tmp-name1))
	   (tmp-name3 (expand-file-name "bar" tmp-name1))
	   (tmp-name4 (expand-file-name "baz" tmp-name1))
	   (default-directory tmp-name1))
      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name2)
	    (write-region "bar" nil tmp-name3)
	    (write-region "baz" nil tmp-name4)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name2))
	    (should (file-exists-p tmp-name3))
	    (should (file-exists-p tmp-name4))

	    ;; `sort' works destructive.
	    (should
	     (equal (file-expand-wildcards "*")
		    (sort (copy-sequence '("foo" "bar" "baz")) 'string<)))
	    (should
	     (equal (file-expand-wildcards "ba?")
		    (sort (copy-sequence '("bar" "baz")) 'string<)))
	    (should
	     (equal (file-expand-wildcards "ba[rz]")
		    (sort (copy-sequence '("bar" "baz")) 'string<)))

	    (should
	     (equal
	      (file-expand-wildcards "*" 'full)
	      (sort
	       (copy-sequence `(,tmp-name2 ,tmp-name3 ,tmp-name4)) 'string<)))
	    (should
	     (equal
	      (file-expand-wildcards "ba?" 'full)
	      (sort (copy-sequence `(,tmp-name3 ,tmp-name4)) 'string<)))
	    (should
	     (equal
	      (file-expand-wildcards "ba[rz]" 'full)
	      (sort (copy-sequence `(,tmp-name3 ,tmp-name4)) 'string<)))

	    (should
	     (equal
	      (file-expand-wildcards (concat tmp-name1 "/" "*"))
	      (sort
	       (copy-sequence `(,tmp-name2 ,tmp-name3 ,tmp-name4)) 'string<)))
	    (should
	     (equal
	      (file-expand-wildcards (concat tmp-name1 "/" "ba?"))
	      (sort (copy-sequence `(,tmp-name3 ,tmp-name4)) 'string<)))
	    (should
	     (equal
	      (file-expand-wildcards (concat tmp-name1 "/" "ba[rz]"))
	      (sort (copy-sequence `(,tmp-name3 ,tmp-name4)) 'string<))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(ert-deftest tramp-test17-insert-directory ()
  "Check `insert-directory'."
  (skip-unless (tramp--test-enabled))
  ;; Ange-FTP is very special.  It does not include the header line
  ;; (this is performed by `dired').  If FULL is nil, it shows just
  ;; one file.  So we refrain from testing.
  (skip-unless (not (tramp--test-ange-ftp-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1
            (expand-file-name (tramp--test-make-temp-name nil quoted)))
	   (tmp-name2 (expand-file-name "foo" tmp-name1))
	   ;; We test for the summary line.  Keyword "total" could be localized.
	   (process-environment
	    (append '("LANG=C" "LANGUAGE=C" "LC_ALL=C") process-environment)))
      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name2)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name2))
	    (with-temp-buffer
	      (insert-directory tmp-name1 nil)
	      (goto-char (point-min))
	      (should (looking-at-p (rx (literal tmp-name1)))))
	    (with-temp-buffer
	      (insert-directory (file-name-as-directory tmp-name1) nil)
	      (goto-char (point-min))
	      (should
               (looking-at-p (rx (literal (file-name-as-directory tmp-name1))))))
	    (with-temp-buffer
	      (insert-directory tmp-name1 "-al")
	      (goto-char (point-min))
	      (should
	       (looking-at-p (rx bol (+ nonl) blank (literal tmp-name1) eol))))
	    (with-temp-buffer
	      (insert-directory (file-name-as-directory tmp-name1) "-al")
	      (goto-char (point-min))
	      (should
	       (looking-at-p
		(rx bol (+ nonl) blank (literal tmp-name1) "/" eol))))
	    (with-temp-buffer
	      (insert-directory
	       (file-name-as-directory tmp-name1) "-al" nil 'full-directory-p)
	      (goto-char (point-min))
	      (should
	       (looking-at-p
		(rx-to-string
		 `(:
		   ;; There might be a summary line.
		   (? (* blank) "total" (+ nonl) (+ digit) (? blank)
		      (? (any "EGKMPTYZk")) (? "i") (? "B") "\n")
		   ;; We don't know in which order ".", ".." and "foo" appear.
		   (= ,(length (directory-files tmp-name1))
		      (+ nonl) blank
		      (| . ,(directory-files tmp-name1))
		      (? " ->" (+ nonl)) "\n"))))))

	    ;; Check error cases.
	    (when (and (tramp--test-supports-set-file-modes-p)
		       ;; With "sshfs", directories with zero file
		       ;; modes are still "accessible".
		       (not (tramp--test-sshfs-p))
		       ;; A directory is always accessible for user "root".
		       (not (zerop (file-attribute-user-id
				    (file-attributes tmp-name1)))))
	      (set-file-modes tmp-name1 0)
	      (with-temp-buffer
		(should-error
		 (insert-directory tmp-name1 nil)
		 :type 'file-error))
	      (set-file-modes tmp-name1 #o777))
	    (delete-directory tmp-name1 'recursive)
	    (with-temp-buffer
	      (should-error
	       (insert-directory tmp-name1 nil)
	       :type 'file-missing)))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(ert-deftest tramp-test17-dired-with-wildcards ()
  "Check `dired' with wildcards."
  ;; `separate' syntax and IPv6 host name syntax do not work.
  (skip-unless
   (not (string-match-p (rx "[") ert-remote-temporary-file-directory)))
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-rsync-p)))
  ;; Wildcards are not supported in tramp-crypt.el.
  (skip-unless (not (tramp--test-crypt-p)))
  ;; Wildcards are not supported with "docker cp ..." or "podman cp ...".
  (skip-unless (not (tramp--test-container-oob-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1
	    (expand-file-name (tramp--test-make-temp-name nil quoted)))
	   (tmp-name2
            (expand-file-name (tramp--test-make-temp-name nil quoted)))
	   (tmp-name3 (expand-file-name "foo" tmp-name1))
	   (tmp-name4 (expand-file-name "bar" tmp-name2))
	   (ert-remote-temporary-file-directory
	    (funcall
	     (if quoted #'file-name-quote #'identity)
	     ert-remote-temporary-file-directory))
	   buffer)
      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name3)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name3))
	    (make-directory tmp-name2)
	    (write-region "foo" nil tmp-name4)
	    (should (file-directory-p tmp-name2))
	    (should (file-exists-p tmp-name4))

	    ;; Check for expanded directory names.
	    (with-current-buffer
		(setq buffer
		      (dired-noselect
		       (expand-file-name
			"tramp-test*" ert-remote-temporary-file-directory)))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name1 ert-remote-temporary-file-directory)))))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name2 ert-remote-temporary-file-directory))))))
	    (kill-buffer buffer)

	    ;; Check for expanded directory and file names.
	    (with-current-buffer
		(setq buffer
		      (dired-noselect
		       (expand-file-name
			"tramp-test*/*" ert-remote-temporary-file-directory)))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name3 ert-remote-temporary-file-directory)))))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name4
		   ert-remote-temporary-file-directory))))))
	    (kill-buffer buffer)

	    ;; Check for special characters.
	    (setq tmp-name3 (expand-file-name "*?" tmp-name1))
	    (setq tmp-name4 (expand-file-name "[a-z0-9]" tmp-name2))
	    (write-region "foo" nil tmp-name3)
	    (should (file-exists-p tmp-name3))
	    (write-region "foo" nil tmp-name4)
	    (should (file-exists-p tmp-name4))

	    (with-current-buffer
		(setq buffer
		      (dired-noselect
		       (expand-file-name
			"tramp-test*/*" ert-remote-temporary-file-directory)))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name3 ert-remote-temporary-file-directory)))))
	      (goto-char (point-min))
	      (should
	       (search-forward-regexp
		(rx
		 (literal
		  (file-relative-name
		   tmp-name4
		   ert-remote-temporary-file-directory))))))
	    (kill-buffer buffer))

	;; Cleanup.
	(ignore-errors (kill-buffer buffer))
	(ignore-errors (delete-directory tmp-name1 'recursive))
	(ignore-errors (delete-directory tmp-name2 'recursive))))))

;; The following test is inspired by Bug#45691.
(ert-deftest tramp-test17-insert-directory-one-file ()
  "Check `insert-directory' inside directory listing."
  (skip-unless (tramp--test-enabled))
  ;; Relative file names in dired are not supported in tramp-crypt.el.
  (skip-unless (not (tramp--test-crypt-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name1
	    (expand-file-name (tramp--test-make-temp-name nil quoted)))
	   (tmp-name2 (expand-file-name "foo" tmp-name1))
	   (tmp-name3 (expand-file-name "bar" tmp-name1))
	   (dired-copy-preserve-time t)
	   (dired-recursive-copies 'top)
	   dired-copy-dereference
	   buffer)
      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name2)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name2))

	    ;; Check, that `insert-directory' works properly.
	    (with-current-buffer
		(setq buffer (dired-noselect tmp-name1 "--dired -al"))
	      (read-only-mode -1)
	      (goto-char (point-min))
	      (while (not (or (eobp)
			      (string-equal
			       (dired-get-filename 'no-dir 'no-error)
			       (file-name-nondirectory tmp-name2))))
		(forward-line 1))
	      (should-not (eobp))
	      (copy-file tmp-name2 tmp-name3)
	      (insert-directory
	       (file-name-nondirectory tmp-name3) "--dired -al -d")
	      ;; Point shall still be the recent file.
	      (should
	       (string-equal
		(dired-get-filename 'no-dir 'no-error)
		(file-name-nondirectory tmp-name2)))
	      (should-not (search-forward "dired" nil t))
	      ;; The copied file has been inserted the line before.
	      (forward-line -1)
	      (should
	       (string-equal
		(dired-get-filename 'no-dir 'no-error)
		(file-name-nondirectory tmp-name3))))
	    (kill-buffer buffer))

	;; Cleanup.
	(ignore-errors (kill-buffer buffer))
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(ert-deftest tramp-test18-file-attributes ()
  "Check `file-attributes'.
This tests also `access-file', `file-readable-p',
`file-regular-p' and `file-ownership-preserved-p'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    ;; We must use `file-truename' for the temporary directory,
    ;; because it could be located on a symlinked directory.  This
    ;; would let the test fail.
    (let* ((ert-remote-temporary-file-directory
	    (file-truename ert-remote-temporary-file-directory))
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (tramp--test-make-temp-name nil quoted))
	   ;; File name with "//".
	   (tmp-name3
	    (format
	     "%s%s"
	     (file-remote-p tmp-name1)
	     (replace-regexp-in-string
	      "/" "//" (file-remote-p tmp-name1 'localname))))
	   ;; `file-ownership-preserved-p' is implemented only in tramp-sh.el.
	   (test-file-ownership-preserved-p (tramp--test-sh-p))
	   attr)
      (unwind-protect
	  (progn
	    (write-region "foo" nil tmp-name1)
	    ;; `access-file' returns nil in case of success.
	    (should-not (access-file tmp-name1 "error"))
	    ;; `access-file' could use a timeout.
	    (let ((remote-file-name-access-timeout 1)
		  comp-warn-primitives)
	      (cl-letf (((symbol-function #'file-exists-p)
			 (lambda (_filename) (sleep-for 5))))
		(should-error
		 (access-file tmp-name1 "error")
		 :type 'file-error)))
	    (delete-file tmp-name1)

	    ;; A sticky bit could damage the `file-ownership-preserved-p' test.
	    (when
		(and test-file-ownership-preserved-p
		     (zerop (logand
			     #o1000
			     (file-modes ert-remote-temporary-file-directory))))
	      (write-region "foo" nil tmp-name1)
	      (setq test-file-ownership-preserved-p
		    (= (file-attribute-group-id (file-attributes tmp-name1))
		       (tramp-get-remote-gid tramp-test-vec 'integer)))
	      (delete-file tmp-name1))

	    (when (tramp--test-supports-set-file-modes-p)
	      (write-region "foo" nil tmp-name1)
	      ;; A file is always accessible for user "root".
	      (unless
		  (zerop (file-attribute-user-id (file-attributes tmp-name1)))
		(set-file-modes tmp-name1 0)
		(should-error
		 (access-file tmp-name1 "error")
		 :type tramp-permission-denied)
		(set-file-modes tmp-name1 #o777))
	      (delete-file tmp-name1))
	    (should-error
	     (access-file tmp-name1 "error")
	     :type 'file-missing)

	    (should-not (file-exists-p tmp-name1))
	    (should-not (file-readable-p tmp-name1))
	    (should-not (file-regular-p tmp-name1))
	    ;; `file-ownership-preserved-p' should return t for
	    ;; non-existing files.
	    (when test-file-ownership-preserved-p
	      (should (file-ownership-preserved-p tmp-name1 'group)))
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-readable-p tmp-name1))
	    (should (file-regular-p tmp-name1))
	    (should-not (access-file tmp-name1 "error"))
	    (when test-file-ownership-preserved-p
	      (should (file-ownership-preserved-p tmp-name1 'group)))

	    ;; We do not test inodes and device numbers.
	    (setq attr (file-attributes tmp-name1))
	    (should (consp attr))
	    (should (null (file-attribute-type attr)))
	    (should (numberp (file-attribute-link-number attr)))
	    (should (numberp (file-attribute-user-id attr)))
	    (should (numberp (file-attribute-group-id attr)))
	    (should
	     (stringp (current-time-string (file-attribute-access-time attr))))
	    (should
	     (stringp
	      (current-time-string (file-attribute-modification-time attr))))
	    (should
	     (stringp
	      (current-time-string (file-attribute-status-change-time attr))))
	    (should (numberp (file-attribute-size attr)))
	    (should (stringp (file-attribute-modes attr)))

	    (setq attr (file-attributes tmp-name1 'string))
	    (should (stringp (file-attribute-user-id attr)))
	    (should (stringp (file-attribute-group-id attr)))

	    (tramp--test-ignore-make-symbolic-link-error
	      (should-error
	       (access-file tmp-name2 "error")
	       :type 'file-missing)
	      (when test-file-ownership-preserved-p
		(should (file-ownership-preserved-p tmp-name2 'group)))
	      (make-symbolic-link tmp-name1 tmp-name2)
	      (should (file-exists-p tmp-name2))
	      (should (file-symlink-p tmp-name2))
	      (should-not (access-file tmp-name2 "error"))
	      (when test-file-ownership-preserved-p
		(should (file-ownership-preserved-p tmp-name2 'group)))
	      (setq attr (file-attributes tmp-name2))
	      (should
	       (string-equal
		(funcall
		 (if quoted #'file-name-quote #'identity)
		 (file-attribute-type attr))
		(file-remote-p (file-truename tmp-name1) 'localname)))
	      (delete-file tmp-name2))

	    ;; Check, that "//" in symlinks are handled properly.
	    (with-temp-buffer
	      (let ((default-directory ert-remote-temporary-file-directory))
		(shell-command
		 (format
		  "ln -s %s %s"
		  (tramp-file-name-localname
		   (tramp-dissect-file-name tmp-name3))
		  (tramp-file-name-localname
		   (tramp-dissect-file-name tmp-name2)))
		 t)))
	    (when (file-symlink-p tmp-name2)
	      (setq attr (file-attributes tmp-name2))
	      (should
	       (string-equal
		(file-attribute-type attr)
		(funcall
		 (if (tramp--test-sshfs-p) #'file-name-nondirectory #'identity)
		 (tramp-file-name-localname
		  (tramp-dissect-file-name tmp-name3)))))
	      (delete-file tmp-name2))

	    (when test-file-ownership-preserved-p
	      (should (file-ownership-preserved-p tmp-name1 'group)))
	    (delete-file tmp-name1)
	    (make-directory tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-readable-p tmp-name1))
	    (should-not (file-regular-p tmp-name1))
	    (should-not (access-file tmp-name1 "error"))
	    (when test-file-ownership-preserved-p
	      (should (file-ownership-preserved-p tmp-name1 'group)))
	    (setq attr (file-attributes tmp-name1))
	    (should (eq (file-attribute-type attr) t)))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name2))))))

(defun tramp--test-set-ert-test-documentation (test command)
  "Set the documentation string for a derived test.
The test is derived from TEST and COMMAND."
  (let ((test-doc
	 (split-string (ert-test-documentation (get test 'ert--test)) "\n")))
    ;; The first line must be extended.
    (setcar
     test-doc (format "%s  Use the \"%s\" command." (car test-doc) command))
    (setf (ert-test-documentation
	   (get (intern (format "%s-with-%s" test command)) 'ert--test))
	  (string-join test-doc "\n"))))

(defmacro tramp--test-deftest-with-stat (test)
  "Define ert `TEST-with-stat'."
  (declare (indent 1))
  `(ert-deftest ,(intern (concat (symbol-name test) "-with-stat")) ()
     :tags '(:expensive-test)
     (tramp--test-set-ert-test-documentation ',test "stat")
     (skip-unless (tramp--test-enabled))
     (skip-unless (tramp--test-sh-p))
     (skip-unless (tramp-get-remote-stat tramp-test-vec))
     (if-let ((default-directory ert-remote-temporary-file-directory)
	      (ert-test (ert-get-test ',test))
	      (result (ert-test-most-recent-result ert-test))
	      (tramp-connection-properties
	       (cons '(nil "perl" nil)
		     tramp-connection-properties)))
	 (progn
	   (skip-unless (< (ert-test-result-duration result) 300))
	   (funcall (ert-test-body ert-test)))
       (ert-skip (format "Test `%s' must run before" ',test)))))

(defmacro tramp--test-deftest-with-perl (test)
  "Define ert `TEST-with-perl'."
  (declare (indent 1))
  `(ert-deftest ,(intern (concat (symbol-name test) "-with-perl")) ()
     :tags '(:expensive-test)
     (tramp--test-set-ert-test-documentation ',test "perl")
     (skip-unless (tramp--test-enabled))
     (skip-unless (tramp--test-sh-p))
     (skip-unless (tramp-get-remote-perl tramp-test-vec))
     (if-let ((default-directory ert-remote-temporary-file-directory)
	      (ert-test (ert-get-test ',test))
	      (result (ert-test-most-recent-result ert-test))
	      (tramp-connection-properties
	       (append
		'((nil "stat" nil)
		  ;; See `tramp-sh-handle-file-truename'.
		  (nil "readlink" nil)
		  ;; See `tramp-sh-handle-get-remote-*'.
		  (nil "id" nil))
		tramp-connection-properties)))
	 (progn
	   (skip-unless (< (ert-test-result-duration result) 300))
	   (funcall (ert-test-body ert-test)))
       (ert-skip (format "Test `%s' must run before" ',test)))))

(defmacro tramp--test-deftest-with-ls (test)
  "Define ert `TEST-with-ls'."
  (declare (indent 1))
  `(ert-deftest ,(intern (concat (symbol-name test) "-with-ls")) ()
     :tags '(:expensive-test)
     (tramp--test-set-ert-test-documentation ',test "ls")
     (skip-unless (tramp--test-enabled))
     (skip-unless (tramp--test-sh-p))
     (if-let ((default-directory ert-remote-temporary-file-directory)
	      (ert-test (ert-get-test ',test))
	      (result (ert-test-most-recent-result ert-test))
	      (tramp-connection-properties
	       (append
		'((nil "perl" nil)
		  (nil "stat" nil)
		  ;; See `tramp-sh-handle-file-truename'.
		  (nil "readlink" nil))
		tramp-connection-properties)))
	 (progn
	   (skip-unless (< (ert-test-result-duration result) 300))
	   (funcall (ert-test-body ert-test)))
       (ert-skip (format "Test `%s' must run before" ',test)))))

(defmacro tramp--test-deftest-without-file-attributes (test)
  "Define ert `TEST-without-file-attributes'."
  (declare (indent 1))
  `(ert-deftest
       ,(intern (concat (symbol-name test) "-without-file-attributes")) ()
     :tags '(:expensive-test)
     (let ((test-doc
	    (split-string
	     (ert-test-documentation (get ',test 'ert--test)) "\n")))
       ;; The first line must be extended.
       (setcar
	test-doc
	(format "%s  Don't Use the \"file-attributes\" cache." (car test-doc)))
       (setf (ert-test-documentation
	      (get
	       (intern (format "%s-without-file-attributes" ',test))
	       'ert--test))
	     (string-join test-doc "\n")))
     (skip-unless (tramp--test-enabled))
     (skip-unless
      (or (tramp--test-adb-p) (tramp--test-sh-p) (tramp--test-sudoedit-p)))
     (if-let ((default-directory ert-remote-temporary-file-directory)
	      (ert-test (ert-get-test ',test))
	      (result (ert-test-most-recent-result ert-test)))
	 (progn
	   (skip-unless (< (ert-test-result-duration result) 300))
	   (let (tramp-use-file-attributes)
	     (funcall (ert-test-body ert-test))))
       (ert-skip (format "Test `%s' must run before" ',test)))))

(tramp--test-deftest-with-stat tramp-test18-file-attributes)

(tramp--test-deftest-with-perl tramp-test18-file-attributes)

(tramp--test-deftest-with-ls tramp-test18-file-attributes)

(tramp--test-deftest-without-file-attributes tramp-test18-file-attributes)

(defvar tramp--test-start-time nil
  "Keep the start time of the current test, a float number.")

(defsubst tramp--test-file-attributes-equal-p (attr1 attr2)
  "Check, whether file attributes ATTR1 and ATTR2 are equal.
They might differ only in time attributes or directory size."
  (let ((attr1 (copy-sequence attr1))
	(attr2 (copy-sequence attr2))
	(start-time (- tramp--test-start-time 10)))
    ;; Link number.  For directories, it includes the number of
    ;; subdirectories.  Set it to 1.
    (when (eq (file-attribute-type attr1) t)
      (setcar (nthcdr 1 attr1) 1))
    (when (eq (file-attribute-type attr2) t)
      (setcar (nthcdr 1 attr2) 1))
    ;; Access time.
    (setcar (nthcdr 4 attr1) tramp-time-dont-know)
    (setcar (nthcdr 4 attr2) tramp-time-dont-know)
    ;; Modification time.  If any of the time values is "don't know",
    ;; we cannot compare, and we normalize the time stamps.  If the
    ;; time value is newer than the test start time, normalize it,
    ;; because due to caching the time stamps could differ slightly (a
    ;; few seconds).  We use a test start time minus 10 seconds, in
    ;; order to compensate a possible timestamp resolution higher than
    ;; a second on the remote machine.
    (when (or (time-equal-p
	       (file-attribute-modification-time attr1) tramp-time-dont-know)
	      (time-equal-p
	       (file-attribute-modification-time attr2) tramp-time-dont-know))
      (setcar (nthcdr 5 attr1) tramp-time-dont-know)
      (setcar (nthcdr 5 attr2) tramp-time-dont-know))
    (when (< start-time
	     (float-time (file-attribute-modification-time attr1)))
      (setcar (nthcdr 5 attr1) tramp-time-dont-know))
    (when (< start-time
	     (float-time (file-attribute-modification-time attr2)))
      (setcar (nthcdr 5 attr2) tramp-time-dont-know))
    ;; Status change time.  Ditto.
    (when (or (time-equal-p
	       (file-attribute-status-change-time attr1) tramp-time-dont-know)
	      (time-equal-p
	       (file-attribute-status-change-time attr2) tramp-time-dont-know))
      (setcar (nthcdr 6 attr1) tramp-time-dont-know)
      (setcar (nthcdr 6 attr2) tramp-time-dont-know))
    (when (< start-time (float-time (file-attribute-status-change-time attr1)))
      (setcar (nthcdr 6 attr1) tramp-time-dont-know))
    (when (< start-time (float-time (file-attribute-status-change-time attr2)))
      (setcar (nthcdr 6 attr2) tramp-time-dont-know))
    ;; Size.  Set it to 0 for directories, because it might have
    ;; changed.  For example the upper directory "../".
    (when (eq (file-attribute-type attr1) t)
      (setcar (nthcdr 7 attr1) 0))
    (when (eq (file-attribute-type attr2) t)
      (setcar (nthcdr 7 attr2) 0))
    ;; The check.
    (unless (equal attr1 attr2) (tramp--test-message "%S\n%S" attr1 attr2))
    (equal attr1 attr2)))

;; This isn't 100% correct, but better than no explainer at all.
(put #'tramp--test-file-attributes-equal-p 'ert-explainer #'ert--explain-equal)

(ert-deftest tramp-test19-directory-files-and-attributes ()
  "Check `directory-files-and-attributes'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    ;; `directory-files-and-attributes' contains also values for
    ;; "../".  Ensure that this doesn't change during tests, for
    ;; example due to handling temporary files.
    (let* ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "bla" tmp-name1))
	   attr)
      (unwind-protect
	  (progn
	    (should-error
	     (directory-files-and-attributes tmp-name1)
	     :type 'file-missing)
	    (make-directory tmp-name1)
	    (should (file-directory-p tmp-name1))
	    (setq tramp--test-start-time
		  (float-time
		   (file-attribute-modification-time
		    (file-attributes tmp-name1))))
	    (make-directory tmp-name2)
	    (should (file-directory-p tmp-name2))
	    (write-region "foo" nil (expand-file-name "foo" tmp-name2))
	    (write-region "bar" nil (expand-file-name "bar" tmp-name2))
	    (write-region "boz" nil (expand-file-name "boz" tmp-name2))

	    (setq attr (directory-files-and-attributes tmp-name2))
	    (should (consp attr))
	    (dolist (elt attr)
	      (should
	       (tramp--test-file-attributes-equal-p
		(file-attributes (expand-file-name (car elt) tmp-name2))
		(cdr elt))))

	    (setq attr (directory-files-and-attributes tmp-name2 'full))
	    (should (consp attr))
	    (dolist (elt attr)
	      (should
	       (tramp--test-file-attributes-equal-p
		(file-attributes (car elt)) (cdr elt))))

	    (setq attr (directory-files-and-attributes
			tmp-name2 nil (rx bos "b")))
	    (should (equal (mapcar #'car attr) '("bar" "boz")))

	    ;; Check the COUNT arg.  It exists since Emacs 28.
	    (when (tramp--test-emacs28-p)
	      (with-no-warnings
		(setq attr (directory-files-and-attributes
			    tmp-name2 nil (rx bos "b") nil nil 1))
		(should (equal (mapcar #'car attr) '("bar"))))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(tramp--test-deftest-with-stat tramp-test19-directory-files-and-attributes)

(tramp--test-deftest-with-perl tramp-test19-directory-files-and-attributes)

(tramp--test-deftest-with-ls tramp-test19-directory-files-and-attributes)

(tramp--test-deftest-without-file-attributes
 tramp-test19-directory-files-and-attributes)

(ert-deftest tramp-test20-file-modes ()
  "Check `file-modes'.
This tests also `file-executable-p', `file-writable-p' and `set-file-modes'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-set-file-modes-p))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted)))

      (unwind-protect
	  (progn
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (set-file-modes tmp-name1 #o777)
	    (should (= (file-modes tmp-name1) #o777))
	    (should (file-executable-p tmp-name1))
	    (should (file-writable-p tmp-name1))
	    (set-file-modes tmp-name1 #o444)
	    (should (= (file-modes tmp-name1) #o444))
	    (should-not (file-executable-p tmp-name1))
	    ;; A file is always writable for user "root".
	    (unless
		(or (zerop (file-attribute-user-id (file-attributes tmp-name1)))
		    (tramp--test-sshfs-p))
	      (should-not (file-writable-p tmp-name1)))
	    ;; Check the NOFOLLOW arg.  It exists since Emacs 28.  For
	    ;; regular files, there shouldn't be a difference.
	    (when (tramp--test-emacs28-p)
	      (with-no-warnings
		(set-file-modes tmp-name1 #o222 'nofollow)
		(should (= (file-modes tmp-name1 'nofollow) #o222))))
	    ;; Setting the mode for not existing files shall fail.
	    (should-error
	     (set-file-modes tmp-name2 #o777)
	     :type 'file-missing))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1)))

      ;; Check the NOFOLLOW arg.  It exists since Emacs 28.  It is
      ;; implemented for tramp-gvfs.el and tramp-sh.el.  However,
      ;; tramp-gvfs,el does not support creating symbolic links.  And
      ;; in tramp-sh.el, we must ensure that the remote chmod command
      ;; supports the "-h" argument.
      (when (and (tramp--test-emacs28-p) (tramp--test-sh-p)
		 (tramp-get-remote-chmod-h tramp-test-vec))
	(unwind-protect
	    (with-no-warnings
	      (write-region "foo" nil tmp-name1)
	      (should (file-exists-p tmp-name1))
	      (make-symbolic-link tmp-name1 tmp-name2)
	      (should
	       (string-equal
		(funcall
		 (if quoted #'file-name-unquote #'identity)
		 (file-remote-p tmp-name1 'localname))
		(file-symlink-p tmp-name2)))
	      ;; Both report the modes of `tmp-name1'.
	      (should
	       (= (file-modes tmp-name1) (file-modes tmp-name2)))
	      ;; `tmp-name1' is a regular file.  NOFOLLOW doesn't matter.
	      (should
	       (= (file-modes tmp-name1) (file-modes tmp-name1 'nofollow)))
	      ;; `tmp-name2' is a symbolic link.  It has different permissions.
	      (should-not
	       (= (file-modes tmp-name2) (file-modes tmp-name2 'nofollow)))
	      (should-not
	       (= (file-modes tmp-name1 'nofollow)
		  (file-modes tmp-name2 'nofollow)))
	      ;; Change permissions.
	      (set-file-modes tmp-name1 #o200)
	      (set-file-modes tmp-name2 #o200)
	      (should
	       (= (file-modes tmp-name1) (file-modes tmp-name2) #o200))
	      ;; Change permissions with NOFOLLOW.
	      (set-file-modes tmp-name1 #o300 'nofollow)
	      (set-file-modes tmp-name2 #o300 'nofollow)
	      (should
	       (= (file-modes tmp-name1 'nofollow)
		  (file-modes tmp-name2 'nofollow)))
	      (should-not (= (file-modes tmp-name1) (file-modes tmp-name2))))

	  ;; Cleanup.
	  (ignore-errors (delete-file tmp-name1))
	  (ignore-errors (delete-file tmp-name2)))))))

;; Method "smb" could run into "NT_STATUS_REVISION_MISMATCH" error.
(defmacro tramp--test-ignore-add-name-to-file-error (&rest body)
  "Run BODY, ignoring \"error with add-name-to-file\" file error."
  (declare (indent defun) (debug (body)))
  `(condition-case err
       (progn ,@body)
     (file-error
      (unless (string-prefix-p "error with add-name-to-file"
			       (error-message-string err))
	(signal (car err) (cdr err))))))

(ert-deftest tramp-test21-file-links ()
  "Check `file-symlink-p'.
This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    ;; We must use `file-truename' for the temporary directory,
    ;; because it could be located on a symlinked directory.  This
    ;; would let the test fail.
    (let* ((ert-remote-temporary-file-directory
	    (file-truename ert-remote-temporary-file-directory))
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (tramp--test-make-temp-name nil quoted))
	   (tmp-name3 (tramp--test-make-temp-name 'local quoted))
	   (tmp-name4 (tramp--test-make-temp-name nil quoted))
	   (tmp-name5
	    (expand-file-name (file-name-nondirectory tmp-name1) tmp-name4))
	   (tmp-name6 (tramp--test-make-temp-name nil quoted)))
      ;; Check `make-symbolic-link'.
      (unwind-protect
	  (tramp--test-ignore-make-symbolic-link-error
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-regular-p tmp-name1))
	    (make-symbolic-link tmp-name1 tmp-name2)
	    (should (file-exists-p tmp-name2))
	    (should (file-regular-p tmp-name2))
	    (should
	     (string-equal
	      (funcall
	       (if quoted #'file-name-unquote #'identity)
	       (file-remote-p tmp-name1 'localname))
	      (file-symlink-p tmp-name2)))
	    (when (tramp--test-expensive-test-p)
	      (should-error
	       (make-symbolic-link tmp-name1 tmp-name2)
	       :type 'file-already-exists))
	    (when (tramp--test-expensive-test-p)
	      ;; A number means interactive case.
	      (cl-letf (((symbol-function #'yes-or-no-p) #'ignore))
		(should-error
		 (make-symbolic-link tmp-name1 tmp-name2 0)
		 :type 'file-already-exists)))
	    (cl-letf (((symbol-function #'yes-or-no-p) #'tramp-compat-always))
	      (make-symbolic-link tmp-name1 tmp-name2 0)
	      (should
	       (string-equal
		(funcall
		 (if quoted #'file-name-unquote #'identity)
		 (file-remote-p tmp-name1 'localname))
		(file-symlink-p tmp-name2))))
	    (make-symbolic-link tmp-name1 tmp-name2 'ok-if-already-exists)
	    (should
	     (string-equal
	      (funcall
	       (if quoted #'file-name-unquote #'identity)
	       (file-remote-p tmp-name1 'localname))
	      (file-symlink-p tmp-name2)))
	    ;; If we use the local part of `tmp-name1', it shall still work.
	    (make-symbolic-link
	     (file-remote-p tmp-name1 'localname)
	     tmp-name2 'ok-if-already-exists)
	    (should
	     (string-equal
	      (funcall
	       (if quoted #'file-name-unquote #'identity)
	       (file-remote-p tmp-name1 'localname))
	      (file-symlink-p tmp-name2)))
	    ;; `tmp-name3' is a local file name.  Therefore, the link
	    ;; target remains unchanged, even if quoted.
	    ;; `make-symbolic-link' might not be permitted on w32 systems.
	    (unless (tramp--test-windows-nt-p)
	      (make-symbolic-link tmp-name1 tmp-name3)
	      (should
	       (string-equal tmp-name1 (file-symlink-p tmp-name3))))
	    ;; Check directory as newname.
	    (make-directory tmp-name4)
	    (should (file-directory-p tmp-name4))
	    (should-not (file-regular-p tmp-name4))
	    (when (tramp--test-expensive-test-p)
	      (should-error
	       (make-symbolic-link tmp-name1 tmp-name4)
	       :type 'file-already-exists))
	    (make-symbolic-link tmp-name1 (file-name-as-directory tmp-name4))
	    (should
	     (string-equal
	      (funcall
	       (if quoted #'file-name-unquote #'identity)
	       (file-remote-p tmp-name1 'localname))
	      (file-symlink-p tmp-name5)))
	    ;; Check, that files in symlinked directories still work.
	    (make-symbolic-link tmp-name4 tmp-name6)
	    (should (file-symlink-p tmp-name6))
	    (should-not (file-regular-p tmp-name6))
	    (write-region "foo" nil (expand-file-name "foo" tmp-name6))
	    (delete-file (expand-file-name "foo" tmp-name6))
	    (should-not (file-exists-p (expand-file-name "foo" tmp-name4)))
	    (should-not (file-exists-p (expand-file-name "foo" tmp-name6))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name2))
	(ignore-errors (delete-file tmp-name3))
	(ignore-errors (delete-file tmp-name5))
	(ignore-errors (delete-file tmp-name6))
	(ignore-errors (delete-directory tmp-name4 'recursive)))

      ;; Check `add-name-to-file'.
      (unwind-protect
	  (when (tramp--test-expensive-test-p)
	    (tramp--test-ignore-add-name-to-file-error
	     (write-region "foo" nil tmp-name1)
	     (should (file-exists-p tmp-name1))
	     (add-name-to-file tmp-name1 tmp-name2)
	     (should (file-regular-p tmp-name2))
	     (should-error
	      (add-name-to-file tmp-name1 tmp-name2)
	      :type 'file-already-exists)
	     ;; A number means interactive case.
	     (cl-letf (((symbol-function #'yes-or-no-p) #'ignore))
	       (should-error
		(add-name-to-file tmp-name1 tmp-name2 0)
		:type 'file-already-exists))
	     (cl-letf (((symbol-function #'yes-or-no-p) #'tramp-compat-always))
	       (add-name-to-file tmp-name1 tmp-name2 0)
	       (should (file-regular-p tmp-name2)))
	     (add-name-to-file tmp-name1 tmp-name2 'ok-if-already-exists)
	     (should-not (file-symlink-p tmp-name2))
	     (should (file-regular-p tmp-name2))
	     ;; `tmp-name3' is a local file name.
	     (should-error
	      (add-name-to-file tmp-name1 tmp-name3)
	      :type 'file-error)
	     ;; Check directory as newname.
	     (make-directory tmp-name4)
	     (should-error
	      (add-name-to-file tmp-name1 tmp-name4)
	      :type 'file-already-exists)
	     (add-name-to-file tmp-name1 (file-name-as-directory tmp-name4))
	     (should
	      (file-regular-p
	       (expand-file-name
		(file-name-nondirectory tmp-name1) tmp-name4)))))

	;; Cleanup.
	(ignore-errors
	  (delete-file tmp-name1)
	  (delete-file tmp-name2)
	  (delete-directory tmp-name4 'recursive)))

      ;; Check `file-truename'.
      (unwind-protect
	  (tramp--test-ignore-make-symbolic-link-error
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-regular-p tmp-name1))
	    (should (string-equal tmp-name1 (file-truename tmp-name1)))
	    (make-symbolic-link tmp-name1 tmp-name2)
	    (should (file-symlink-p tmp-name2))
	    (should (file-regular-p tmp-name2))
	    (should-not (string-equal tmp-name2 (file-truename tmp-name2)))
	    (should
	     (string-equal (file-truename tmp-name1) (file-truename tmp-name2)))
	    (should (file-equal-p tmp-name1 tmp-name2))
	    ;; Check relative symlink file name.
	    (delete-file tmp-name2)
	    (let ((default-directory ert-remote-temporary-file-directory))
	      (make-symbolic-link (file-name-nondirectory tmp-name1) tmp-name2))
	    (should (file-symlink-p tmp-name2))
	    (should (file-regular-p tmp-name2))
	    (should-not (string-equal tmp-name2 (file-truename tmp-name2)))
	    (should
	     (string-equal (file-truename tmp-name1) (file-truename tmp-name2)))
	    (should (file-equal-p tmp-name1 tmp-name2))
	    ;; Symbolic links could look like a remote file name.
	    ;; They must be quoted then.
	    (let ((penguin
		   (if (eq tramp-syntax 'separate)
		       "/[penguin/motd]" "/penguin:motd:")))
	      (delete-file tmp-name2)
	      (make-symbolic-link
	       (funcall (if quoted #'file-name-unquote #'identity) penguin)
	       tmp-name2)
	      (should (file-symlink-p tmp-name2))
	      (should-not (file-regular-p tmp-name2))
	      (should
	       (string-equal
		(file-truename tmp-name2)
		(file-name-quote (concat (file-remote-p tmp-name2) penguin)))))
	    ;; `tmp-name3' is a local file name.
	    ;; `make-symbolic-link' might not be permitted on w32 systems.
	    (unless (tramp--test-windows-nt-p)
	      (make-symbolic-link tmp-name1 tmp-name3)
	      (should (file-symlink-p tmp-name3))
	      (should-not (file-regular-p tmp-name3))
              (should-not (string-equal tmp-name3 (file-truename tmp-name3)))
	      ;; `file-truename' returns a quoted file name for `tmp-name3'.
	      ;; We must unquote it.
	      (should
	       (string-equal
		(file-truename tmp-name1)
		(file-name-unquote (file-truename tmp-name3))))))

	;; Cleanup.
	(ignore-errors
	  (delete-file tmp-name1)
	  (delete-file tmp-name2)
	  (delete-file tmp-name3)))

      ;; Symbolic links could be nested.
      (unwind-protect
	  (tramp--test-ignore-make-symbolic-link-error
	    (make-directory tmp-name1)
	    (should (file-directory-p tmp-name1))
	    (let* ((ert-remote-temporary-file-directory
		    (file-truename tmp-name1))
		   (tmp-name2 (tramp--test-make-temp-name nil quoted))
		   (tmp-name3 tmp-name2)
		   (number-nesting 15))
	      (dotimes (_ number-nesting)
		(make-symbolic-link
		 tmp-name3
		 (setq tmp-name3 (tramp--test-make-temp-name nil quoted))))
	      (should-not (file-regular-p tmp-name2))
	      (should-not (file-regular-p tmp-name3))
	      (should
	       (string-equal
		(file-truename tmp-name2)
		(file-truename tmp-name3)))
	      (when (tramp--test-expensive-test-p)
		(should-error
		 (with-temp-buffer (insert-file-contents tmp-name2))
		 :type 'file-missing))
	      (when (tramp--test-expensive-test-p)
		(should-error
		 (with-temp-buffer (insert-file-contents tmp-name3))
		 :type 'file-missing))
	      ;; `directory-files' does not show symlinks to
	      ;; non-existing targets in the "smb" case.  So we remove
	      ;; the symlinks manually.
	      (while (stringp (setq tmp-name2 (file-symlink-p tmp-name3)))
		(delete-file tmp-name3)
		(setq tmp-name3 (concat (file-remote-p tmp-name3) tmp-name2)))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name2))
	(ignore-errors (delete-file tmp-name3))
	(ignore-errors (delete-directory tmp-name1 'recursive)))

      ;; Detect cyclic symbolic links.
      (unwind-protect
	  (when (tramp--test-expensive-test-p)
	    (tramp--test-ignore-make-symbolic-link-error
	     (make-symbolic-link tmp-name2 tmp-name1)
	     (should (file-symlink-p tmp-name1))
	     (should-not (file-regular-p tmp-name1))
	     (should-not (file-regular-p tmp-name2))
	     (should
	      (string-equal
	       (file-truename tmp-name1)
	       (file-truename tmp-name2)))
	     (if (tramp--test-smb-p)
		 ;; The symlink command of "smbclient" detects the
		 ;; cycle already.
		 (should-error
		  (make-symbolic-link tmp-name1 tmp-name2)
		  :type 'file-error)
	       (make-symbolic-link tmp-name1 tmp-name2)
	       (should (file-symlink-p tmp-name1))
	       (should (file-symlink-p tmp-name2))
	       (should-not (file-regular-p tmp-name1))
	       (should-not (file-regular-p tmp-name2))
	       (should-error
		(file-truename tmp-name1)
		:type 'file-error)
	       (should-error
		(file-truename tmp-name2)
		:type 'file-error))))

	;; Cleanup.
	(ignore-errors
	  (delete-file tmp-name1)
	  (delete-file tmp-name2)))

      ;; `file-truename' shall preserve trailing slash of directories.
      (let* ((dir1
	      (directory-file-name
	       (funcall
		(if quoted #'file-name-quote #'identity)
		ert-remote-temporary-file-directory)))
	     (dir2 (file-name-as-directory dir1)))
	(should (string-equal (file-truename dir1) (expand-file-name dir1)))
	(should (string-equal (file-truename dir2) (expand-file-name dir2)))))))

(ert-deftest tramp-test22-file-times ()
  "Check `set-file-times' and `file-newer-than-file-p'."
  (skip-unless (tramp--test-enabled))
  (skip-unless
   (or (tramp--test-adb-p) (tramp--test-gvfs-p)
       (tramp--test-sh-p) (tramp--test-sudoedit-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (tmp-name3 (tramp--test-make-temp-name nil quoted)))
      (unwind-protect
	  (progn
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (consp (file-attribute-modification-time
			    (file-attributes tmp-name1))))
	    ;; Skip the test, if the remote handler is not able to set
	    ;; the correct time.
	    ;; Some remote machines cannot resolve seconds.  So we use a minute.
	    (skip-unless (set-file-times tmp-name1 (seconds-to-time 60)))
	    ;; Dumb remote shells without perl(1) or stat(1) are not
	    ;; able to return the date correctly.  They say "don't know".
	    (unless (time-equal-p
		     (file-attribute-modification-time
		      (file-attributes tmp-name1))
		     tramp-time-dont-know)
	      (should
	       (time-equal-p
                (file-attribute-modification-time (file-attributes tmp-name1))
		(seconds-to-time 60)))
	      ;; Setting the time for not existing files shall fail.
	      (should-error
	       (set-file-times tmp-name2)
	       :type 'file-missing)
	      (write-region "bla" nil tmp-name2)
	      (should (file-exists-p tmp-name2))
	      (should (file-newer-than-file-p tmp-name2 tmp-name1))
	      ;; `tmp-name3' does not exist.
	      (should (file-newer-than-file-p tmp-name2 tmp-name3))
	      (should-not (file-newer-than-file-p tmp-name3 tmp-name1))
	      ;; Check the NOFOLLOW arg.  It exists since Emacs 28.  For
	      ;; regular files, there shouldn't be a difference.
	      (when (tramp--test-emacs28-p)
		(with-no-warnings
		  (set-file-times tmp-name1 (seconds-to-time 60) 'nofollow)
		  (should
		   (time-equal-p
                    (file-attribute-modification-time
		     (file-attributes tmp-name1))
		    (seconds-to-time 60)))))))

	;; Cleanup.
	(ignore-errors
	  (delete-file tmp-name1)
	  (delete-file tmp-name2))))))

(ert-deftest tramp-test23-visited-file-modtime ()
  "Check `set-visited-file-modtime' and `verify-visited-file-modtime'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted)))
      (unwind-protect
	  (progn
	    (write-region "foo" nil tmp-name)
	    (should (file-exists-p tmp-name))
	    (with-temp-buffer
	      (insert-file-contents tmp-name)
	      (should (verify-visited-file-modtime))
              (set-visited-file-modtime (seconds-to-time 1))
	      (should (verify-visited-file-modtime))
	      (should (= 1 (float-time (visited-file-modtime))))

	      ;; Checks with deleted file.
	      (delete-file tmp-name)
	      (dired-uncache tmp-name)
	      (should (verify-visited-file-modtime))
              (set-visited-file-modtime (seconds-to-time 1))
	      (should (verify-visited-file-modtime))
	      (should (= 1 (float-time (visited-file-modtime))))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name))))))

;; This test is inspired by Bug#29149.
(ert-deftest tramp-test24-file-acl ()
  "Check that `file-acl' and `set-file-acl' work proper."
  (skip-unless (tramp--test-enabled))
  ;; The following test checks also whether `set-file-modes' will work.
  (skip-unless (file-acl ert-remote-temporary-file-directory))
  (skip-unless (not (tramp--test-crypt-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (tmp-name3 (tramp--test-make-temp-name 'local quoted)))
      ;; Both files are remote.
      (unwind-protect
	  (progn
	    ;; Two files with same ACLs.
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-acl tmp-name1))
	    (copy-file tmp-name1 tmp-name2 nil nil nil 'preserve-permissions)
	    (should (file-acl tmp-name2))
	    (should (string-equal (file-acl tmp-name1) (file-acl tmp-name2)))
	    ;; Different permissions mean different ACLs.
	    (unless (tramp--test-windows-nt-or-smb-p)
	      (set-file-modes tmp-name1 #o777)
	      (set-file-modes tmp-name2 #o444)
	      (should-not
	       (string-equal (file-acl tmp-name1) (file-acl tmp-name2))))
	    ;; Copy ACL.  Not all remote handlers support it, so we test.
	    (when (set-file-acl tmp-name2 (file-acl tmp-name1))
	      (should (string-equal (file-acl tmp-name1) (file-acl tmp-name2))))
	    ;; An invalid ACL does not harm.
	    (should-not (set-file-acl tmp-name2 "foo")))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name2)))

      ;; Remote and local file.
      (unwind-protect
	  (when (and (file-acl temporary-file-directory)
		     (not (tramp--test-windows-nt-or-smb-p)))
	    ;; Two files with same ACLs.
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-acl tmp-name1))
	    (copy-file tmp-name1 tmp-name3 nil nil nil 'preserve-permissions)
	    (should (file-acl tmp-name3))
	    (should (string-equal (file-acl tmp-name1) (file-acl tmp-name3)))
	    ;; Different permissions mean different ACLs.
	    (set-file-modes tmp-name1 #o777)
	    (set-file-modes tmp-name3 #o444)
	    (should-not
	     (string-equal (file-acl tmp-name1) (file-acl tmp-name3)))
	    ;; Copy ACL.  Since we don't know whether Emacs is built
	    ;; with local ACL support, we must check it.
	    (when (set-file-acl tmp-name3 (file-acl tmp-name1))
	      (should (string-equal (file-acl tmp-name1) (file-acl tmp-name3))))

	    ;; Two files with same ACLs.
	    (delete-file tmp-name1)
	    (copy-file tmp-name3 tmp-name1 nil nil nil 'preserve-permissions)
	    (should (file-acl tmp-name1))
	    (should (string-equal (file-acl tmp-name1) (file-acl tmp-name3)))
	    ;; Different permissions mean different ACLs.
	    (set-file-modes tmp-name1 #o777)
	    (set-file-modes tmp-name3 #o444)
	    (should-not
	     (string-equal (file-acl tmp-name1) (file-acl tmp-name3)))
	    ;; Copy ACL.
	    (set-file-acl tmp-name1 (file-acl tmp-name3))
	    (should (string-equal (file-acl tmp-name1) (file-acl tmp-name3))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name3))))))

(ert-deftest tramp-test25-file-selinux ()
  "Check `file-selinux-context' and `set-file-selinux-context'."
  (skip-unless (tramp--test-enabled))
  (skip-unless
   (not (equal (file-selinux-context ert-remote-temporary-file-directory)
	       '(nil nil nil nil))))
  (skip-unless (not (tramp--test-crypt-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (tmp-name3 (tramp--test-make-temp-name 'local quoted)))
      ;; Both files are remote.
      (unwind-protect
	  (progn
	    ;; Two files with same SELinux context.
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-selinux-context tmp-name1))
	    (copy-file tmp-name1 tmp-name2 nil nil nil 'preserve-permissions)
	    (should (file-selinux-context tmp-name2))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name2)))
	    ;; Check different SELinux context.  We cannot support
	    ;; different ranges in this test; let's assume the most
	    ;; likely one.
	    (let ((context (file-selinux-context tmp-name1)))
	      (when (and (string-equal (nth 3 context) "s0")
			 (setcar (nthcdr 3 context) "s0:c0")
			 (set-file-selinux-context tmp-name1 context))
		(should-not
		 (equal
		  (file-selinux-context tmp-name1)
		  (file-selinux-context tmp-name2)))))
	    ;; Copy SELinux context.
	    (should
	     (set-file-selinux-context
	      tmp-name2 (file-selinux-context tmp-name1)))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name2)))
	    ;; An invalid SELinux context does not harm.
	    (should-not (set-file-selinux-context tmp-name2 "foo")))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name2)))

      ;; Remote and local file.
      (unwind-protect
	  (when (and (not
		      (or (equal (file-selinux-context temporary-file-directory)
				 '(nil nil nil nil))
			  (tramp--test-windows-nt-or-smb-p)))
		     ;; Both users shall use the same SELinux context.
		     (string-equal
		      (let ((default-directory temporary-file-directory))
			(shell-command-to-string "id -Z"))
		      (let ((default-directory
			      ert-remote-temporary-file-directory))
			(shell-command-to-string "id -Z"))))

	    ;; Two files with same SELinux context.
	    (write-region "foo" nil tmp-name1)
	    (should (file-exists-p tmp-name1))
	    (should (file-selinux-context tmp-name1))
	    (copy-file tmp-name1 tmp-name3)
	    (should (file-selinux-context tmp-name3))
	    ;; We cannot expect that copying over file system
	    ;; boundaries keeps SELinux context.  So we copy it
	    ;; explicitly.
	    (should
	     (set-file-selinux-context
	      tmp-name3 (file-selinux-context tmp-name1)))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name3)))
	    ;; Check different SELinux context.  We cannot support
	    ;; different ranges in this test; let's assume the most
	    ;; likely one.
	    (let ((context (file-selinux-context tmp-name1)))
	      (when (and (string-equal (nth 3 context) "s0")
			 (setcar (nthcdr 3 context) "s0:c0")
			 (set-file-selinux-context tmp-name1 context))
		(should-not
		 (equal
		  (file-selinux-context tmp-name1)
		  (file-selinux-context tmp-name3)))))
	    ;; Copy SELinux context.
	    (should
	     (set-file-selinux-context
	      tmp-name3 (file-selinux-context tmp-name1)))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name3)))

	    ;; Two files with same SELinux context.
	    (delete-file tmp-name1)
	    (copy-file tmp-name3 tmp-name1)
	    (should (file-selinux-context tmp-name1))
	    ;; We cannot expect that copying over file system
	    ;; boundaries keeps SELinux context.  So we copy it
	    ;; explicitly.
	    (should
	     (set-file-selinux-context
	      tmp-name1 (file-selinux-context tmp-name3)))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name3)))
	    ;; Check different SELinux context.  We cannot support
	    ;; different ranges in this test; let's assume the most
	    ;; likely one.
	    (let ((context (file-selinux-context tmp-name3)))
	      (when (and (string-equal (nth 3 context) "s0")
			 (setcar (nthcdr 3 context) "s0:c0")
			 (set-file-selinux-context tmp-name3 context))
		(should-not
		 (equal
		  (file-selinux-context tmp-name1)
		  (file-selinux-context tmp-name3)))))
	    ;; Copy SELinux context.
	    (should
	     (set-file-selinux-context
	      tmp-name1 (file-selinux-context tmp-name3)))
	    (should
	     (equal
	      (file-selinux-context tmp-name1)
	      (file-selinux-context tmp-name3))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-file tmp-name3))))))

(ert-deftest tramp-test26-file-name-completion ()
  "Check `file-name-completion' and `file-name-all-completions'."
  (skip-unless (tramp--test-enabled))

  ;; Method and host name in completion mode.
  (let ((tramp-fuse-remove-hidden-files t)
	(method (file-remote-p ert-remote-temporary-file-directory 'method))
	(host (file-remote-p ert-remote-temporary-file-directory 'host))
        (orig-syntax tramp-syntax)
        (minibuffer-completing-file-name t))
    (when (and (stringp host)
	       (string-match
		(rx (regexp tramp-prefix-port-regexp) (regexp tramp-port-regexp))
		host))
      (setq host (replace-match "" nil nil host)))

    (unwind-protect
        (dolist (syntax (if (tramp--test-expensive-test-p)
		            (tramp-syntax-values) `(,orig-syntax)))
          (tramp-change-syntax syntax)
	  ;; This has cleaned up all connection data, which are used
	  ;; for completion.  We must refill the cache.
	  (tramp-set-connection-property tramp-test-vec "property" nil)

          (let (;; This is needed for the `separate' syntax.
                (prefix-format (substring tramp-prefix-format 1))
		;; This is needed for the IPv6 host name syntax.
		(ipv6-prefix
		 (and (string-match-p tramp-ipv6-regexp host)
		      tramp-prefix-ipv6-format))
		(ipv6-postfix
		 (and (string-match-p tramp-ipv6-regexp host)
		      tramp-postfix-ipv6-format)))
            ;; Complete method name.
	    (unless (or (tramp-string-empty-or-nil-p method)
                        (string-empty-p tramp-method-regexp))
	      (should
	       (member
		(concat prefix-format method tramp-postfix-method-format)
		(file-name-all-completions
                 (concat prefix-format (substring method 0 1)) "/"))))
            ;; Complete host name.
	    (unless (or (tramp-string-empty-or-nil-p method)
                        (string-empty-p tramp-method-regexp)
                        (tramp-string-empty-or-nil-p host))
	      (should
	       (member
		(concat
                 prefix-format method tramp-postfix-method-format
		 ipv6-prefix host ipv6-postfix tramp-postfix-host-format)
		(file-name-all-completions
		 (concat prefix-format method tramp-postfix-method-format)
                 "/"))))))

      ;; Cleanup.
      (tramp-change-syntax orig-syntax)))

  (dolist (non-essential '(nil t))
    (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
      (let ((tramp-fuse-remove-hidden-files t)
	    (tmp-name (tramp--test-make-temp-name nil quoted)))

	(unwind-protect
	    (progn
	      ;; Local files.
	      (make-directory tmp-name)
	      (should (file-directory-p tmp-name))
	      (write-region "foo" nil (expand-file-name "foo" tmp-name))
	      (should (file-exists-p (expand-file-name "foo" tmp-name)))
	      (write-region "bar" nil (expand-file-name "bold" tmp-name))
	      (should (file-exists-p (expand-file-name "bold" tmp-name)))
	      (make-directory (expand-file-name "boz" tmp-name))
	      (should (file-directory-p (expand-file-name "boz" tmp-name)))
	      (should (equal (file-name-completion "fo" tmp-name) "foo"))
	      (should (equal (file-name-completion "foo" tmp-name) t))
	      (should (equal (file-name-completion "b" tmp-name) "bo"))
	      (should-not (file-name-completion "a" tmp-name))
	      ;; `file-name-completion' should not err out if
	      ;; directory does not exist.  (Bug#61890)
	      ;; Ange-FTP does not support this.
	      (unless (tramp--test-ange-ftp-p)
		(should-not
		 (file-name-completion
		  "a" (tramp-compat-file-name-concat tmp-name "fuzz"))))
	      ;; Ange-FTP does not support predicates.
	      (unless (tramp--test-ange-ftp-p)
		(should
		 (equal
		  (file-name-completion "b" tmp-name #'file-directory-p)
		  "boz/")))
	      (should
	       (equal (file-name-all-completions "fo" tmp-name) '("foo")))
	      (should
	       (equal
		(sort (file-name-all-completions "b" tmp-name) #'string-lessp)
		'("bold" "boz/")))
	      (should-not (file-name-all-completions "a" tmp-name))
	      ;; `completion-regexp-list' restricts the completion to
	      ;; files which match all expressions in this list.
	      ;; Ange-FTP does not complete "".
	      (unless (tramp--test-ange-ftp-p)
		(let ((completion-regexp-list
		       `(,directory-files-no-dot-files-regexp "b")))
		  (should
		   (equal (file-name-completion "" tmp-name) "bo"))
		  (should
		   (equal
		    (sort
		     (file-name-all-completions "" tmp-name) #'string-lessp)
		    '("bold" "boz/")))))
	      ;; `file-name-completion' ignores file names that end in
	      ;; any string in `completion-ignored-extensions'.
	      (let ((completion-ignored-extensions '(".ext")))
		(write-region "foo" nil (expand-file-name "foo.ext" tmp-name))
		(should (file-exists-p (expand-file-name "foo.ext" tmp-name)))
		(should (equal (file-name-completion "fo" tmp-name) "foo"))
		(should (equal (file-name-completion "foo" tmp-name) t))
		(should
		 (equal (file-name-completion "foo." tmp-name) "foo.ext"))
		(should (equal (file-name-completion "foo.ext" tmp-name) t))
		;; `file-name-all-completions' is not affected.
		(should
		 (equal
		  (sort (file-name-all-completions "" tmp-name) #'string-lessp)
		  '("../" "./" "bold" "boz/" "foo" "foo.ext")))))

	  ;; Cleanup.
	  (ignore-errors (delete-directory tmp-name 'recursive)))))))

(tramp--test-deftest-with-perl tramp-test26-file-name-completion)

(tramp--test-deftest-with-ls tramp-test26-file-name-completion)

;; This test is inspired by Bug#51386, Bug#52758, Bug#53513, Bug#54042
;; and Bug#60505.
(ert-deftest tramp-test26-interactive-file-name-completion ()
  "Check interactive completion with different `completion-styles'."
  ;; Method, user and host name in completion mode.
  (tramp-cleanup-connection tramp-test-vec nil 'keep-password)

  (let ((method (file-remote-p ert-remote-temporary-file-directory 'method))
	(user (file-remote-p ert-remote-temporary-file-directory 'user))
	(host (file-remote-p ert-remote-temporary-file-directory 'host))
	(hop (file-remote-p ert-remote-temporary-file-directory 'hop))
        (orig-syntax tramp-syntax)
        (non-essential t)
	(inhibit-message t))
    (when (and (stringp host)
	       (string-match
		(rx (regexp tramp-prefix-port-regexp) (regexp tramp-port-regexp))
		host))
      (setq host (replace-match "" nil nil host)))

    ;; (trace-function #'tramp-completion-file-name-handler)
    ;; (trace-function #'completion-file-name-table)
    (unwind-protect
        (dolist (syntax (if (tramp--test-expensive-test-p)
		            (tramp-syntax-values) `(,orig-syntax)))
          (tramp-change-syntax syntax)
	  ;; This has cleaned up all connection data, which are used
	  ;; for completion.  We must refill the cache.
	  (tramp-set-connection-property tramp-test-vec "property" nil)

          (dolist
              (style
               (if (tramp--test-expensive-test-p)
                   ;; It doesn't work for `initials' and `shorthand'
                   ;; completion styles.  Should it?
		   ;; `orderless' passes the tests, but it is an ELPA package.
                   '(emacs21 emacs22 basic partial-completion substring flex)
		 '(basic)))

	    (when (assoc style completion-styles-alist)
	      (let* (;; Force the real minibuffer in batch mode.
                     (executing-kbd-macro noninteractive)
                     (completion-styles `(,style))
                     completion-category-defaults
                     completion-category-overrides
                     ;; This is needed for the `simplified' syntax,
                     (tramp-default-method method)
                     (method-string
		      (unless (string-empty-p tramp-method-regexp)
			(concat method tramp-postfix-method-format)))
		     (user-string
		      (unless (tramp-string-empty-or-nil-p user)
			(concat user tramp-postfix-user-format)))
		     ;; This is needed for the IPv6 host name syntax.
		     (ipv6-prefix
		      (and (string-match-p tramp-ipv6-regexp host)
		           tramp-prefix-ipv6-format))
		     (ipv6-postfix
		      (and (string-match-p tramp-ipv6-regexp host)
		           tramp-postfix-ipv6-format))
		     (host-string
		      (unless (tramp-string-empty-or-nil-p host)
			(concat
			 ipv6-prefix host
			 ipv6-postfix tramp-postfix-host-format)))
		     ;; The hop string fits only the initial syntax.
		     (hop (and (eq tramp-syntax orig-syntax) hop))
                     test result completions)

		(dolist
		    (test-and-result
		     ;; These are triples of strings (TEST-STRING
		     ;; RESULT-CHECK COMPLETION-CHECK).  RESULT-CHECK
		     ;; could be not unique, in this case it is a list
		     ;; (RESULT1 RESULT2 ...).
		     (append
		      ;; Complete method name.
		      (unless (string-empty-p tramp-method-regexp)
			`((,(concat
                             tramp-prefix-format hop
                             (substring-no-properties
			      method 0 (min 2 (length method))))
			   ,(concat tramp-prefix-format hop method-string)
			   ,method-string)))
		      ;; Complete user name.
		      (unless (tramp-string-empty-or-nil-p user)
			`((,(concat
                             tramp-prefix-format hop method-string
                             (substring-no-properties
			      user 0 (min 2 (length user))))
			   ,(concat
                             tramp-prefix-format hop method-string user-string)
			   ,user-string)))
		      ;; Complete host name.
		      (unless (tramp-string-empty-or-nil-p host)
			`((,(concat
                             tramp-prefix-format hop method-string
			     ipv6-prefix
			     (substring-no-properties
			      host 0 (min 2 (length host))))
			   (,(concat
			      tramp-prefix-format hop method-string host-string)
			    ,(concat
			      tramp-prefix-format hop method-string
			      user-string host-string))
			   ,host-string)))
		      ;; Complete user and host name.
		      (unless (or (tramp-string-empty-or-nil-p user)
				  (tramp-string-empty-or-nil-p host))
			`((,(concat
                             tramp-prefix-format hop method-string user-string
			     ipv6-prefix
			     (substring-no-properties
			      host 0 (min 2 (length host))))
			   ,(concat
                             tramp-prefix-format hop method-string
	                     user-string host-string)
			   ,host-string)))))

                  (ignore-errors (kill-buffer "*Completions*"))
                  ;; (and (bufferp trace-buffer) (kill-buffer trace-buffer))
                  (discard-input)
                  (setq test (car test-and-result)
                        unread-command-events
                        (mapcar #'identity (concat test "\t\t\n"))
                        completions nil
                        result (read-file-name "Prompt: "))

                  (if (or (not (get-buffer "*Completions*"))
			  (string-match-p
			   (if (string-empty-p tramp-method-regexp)
			       (rx
				(| (regexp tramp-postfix-user-regexp)
				   (regexp tramp-postfix-host-regexp))
				eos)
			     (rx
			      (| (regexp tramp-postfix-method-regexp)
				 (regexp tramp-postfix-user-regexp)
				 (regexp tramp-postfix-host-regexp))
			      eos))
			   result))
		      (progn
                        ;; (tramp--test-message
                        ;;  "syntax: %s style: %s test: %s result: %s"
                        ;;  syntax style test result)
			(if (stringp (cadr test-and-result))
			    (should
			     (string-prefix-p (cadr test-and-result) result))
			  (should
			   (let (res)
			     (dolist (elem (cadr test-and-result) res)
			       (setq
				res (or res (string-prefix-p elem result))))))))

                    (with-current-buffer "*Completions*"
		      ;; We must remove leading `default-directory'.
		      (goto-char (point-min))
		      (let ((inhibit-read-only t))
			(while (search-forward-regexp "//" nil 'noerror)
			  (delete-region (line-beginning-position) (point))))
		      (goto-char (point-min))
		      (search-forward-regexp
		       (rx bol (0+ nonl)
			   (any "Pp") "ossible completions"
			   (0+ nonl) eol))
		      (forward-line 1)
		      (setq completions
                            (split-string
                             (buffer-substring-no-properties (point) (point-max))
                             (rx (any "\r\n\t ")) 'omit)))

                    ;; (tramp--test-message
                    ;;  "syntax: %s style: %s test: %s result: %s completions: %S"
                    ;;  syntax style test result completions)
                    (should (member (caddr test-and-result) completions))))))))

      ;; Cleanup.
      ;; (tramp--test-message "%s" (tramp-get-buffer-string trace-buffer))
      ;; (untrace-function #'tramp-completion-file-name-handler)
      ;; (untrace-function #'completion-file-name-table)
      (tramp-change-syntax orig-syntax))))

(ert-deftest tramp-test27-load ()
  "Check `load'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted)))
      (unwind-protect
	  (progn
	    ;; Ange-FTP does not tolerate a missing file, even with `noerror'.
	    (unless (tramp--test-ange-ftp-p)
	      (load tmp-name 'noerror 'nomessage))
	    (should-not (featurep 'tramp-test-load))
	    (write-region "(provide 'tramp-test-load)" nil tmp-name)
	    ;; `load' in lread.c passes `must-suffix' since Emacs 29.
	    ;; In Ange-FTP, `must-suffix' is ignored.
	    (when (and (tramp--test-emacs29-p)
                       (not (tramp--test-ange-ftp-p)))
	      (should-error
	       (load tmp-name nil 'nomessage 'nosuffix 'must-suffix)
	       :type 'file-error))
	    (load tmp-name nil 'nomessage 'nosuffix)
	    (should (featurep 'tramp-test-load)))

	;; Cleanup.
	(ignore-errors
	  (and (featurep 'tramp-test-load) (unload-feature 'tramp-test-load))
	  (delete-file tmp-name))))))

(defun tramp--test-shell-file-name ()
  "Return default remote shell."
  (let ((default-directory ert-remote-temporary-file-directory))
    (tramp-compat-connection-local-value shell-file-name)))

(defun tramp--test-shell-command-switch ()
  "Return default remote shell command switch."
  (let ((default-directory ert-remote-temporary-file-directory))
    (tramp-compat-connection-local-value shell-command-switch)))

(ert-deftest tramp-test28-process-file ()
  "Check `process-file'."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let* ((tmp-name (tramp--test-make-temp-name nil quoted))
	   (fnnd (file-name-nondirectory tmp-name))
	   (default-directory ert-remote-temporary-file-directory)
	   (buffer (get-buffer-create "*tramp-tests*"))
	   kill-buffer-query-functions)
      (unwind-protect
	  (progn
	    ;; We cannot use "/bin/true" and "/bin/false"; those paths
	    ;; do not exist on hydra and on MS Windows.
	    (should (zerop (process-file "true")))
	    (should-not (zerop (process-file "false")))
	    (should-not (zerop (process-file "binary-does-not-exist")))
	    ;; Return exit code.
	    (should (= 42 (process-file
			   (tramp--test-shell-file-name) nil nil nil
			   (tramp--test-shell-command-switch) "exit 42")))
	    ;; Return exit code in case the process is interrupted,
	    ;; and there's no indication for a signal describing string.
	    (unless (tramp--test-sshfs-p)
	      (let (process-file-return-signal-string)
		(should
		 (= (+ 128 2)
		    (process-file
		     (tramp--test-shell-file-name) nil nil nil
		     (tramp--test-shell-command-switch) "kill -2 $$")))))
	    ;; Return string in case the process is interrupted and
	    ;; there's an indication for a signal describing string.
	    (unless (tramp--test-sshfs-p)
	      (let ((process-file-return-signal-string t))
		(should
		 (string-match-p
		  (rx (| "Interrupt" "Signal 2"))
		  (process-file
		   (tramp--test-shell-file-name) nil nil nil
		   (tramp--test-shell-command-switch) "kill -2 $$")))))

	    ;; Check DESTINATION.
	    (dolist (destination `(nil t ,buffer))
	      (when (bufferp destination)
		(with-current-buffer destination
		  (delete-region (point-min) (point-max))))
	      (with-temp-buffer
		(write-region "foo" nil tmp-name)
		(should (file-exists-p tmp-name))
		(should (zerop (process-file "ls" nil destination nil fnnd)))
		(with-current-buffer
		    (if (bufferp destination) destination (current-buffer))
		  ;; "ls" could produce colorized output.
		  (goto-char (point-min))
		  (while (search-forward-regexp
			  ansi-color-control-seq-regexp nil t)
		    (replace-match "" nil nil))
		  (should
		   (string-equal (if destination (format "%s\n" fnnd) "")
				 (buffer-string)))
		  (should-not (get-buffer-window (current-buffer) t))
		  (goto-char (point-max)))

		;; Second run.  The output must be appended.
		(should (zerop (process-file "ls" nil destination t fnnd)))
		(with-current-buffer
		    (if (bufferp destination) destination (current-buffer))
		  ;; "ls" could produce colorized output.
		  (goto-char (point-min))
		  (while (search-forward-regexp
			  ansi-color-control-seq-regexp nil t)
		    (replace-match "" nil nil))
		  (should
		   (string-equal
		    (if destination (format "%s\n%s\n" fnnd fnnd) "")
		    (buffer-string))))

		(unless (eq destination t)
		  (should (string-empty-p (buffer-string))))
		;; A non-nil DISPLAY must not raise the buffer.
		(should-not (get-buffer-window (current-buffer) t))
		(delete-file tmp-name)))

	    ;; Check remote and local INFILE.
	    (dolist (local '(nil t))
	      (with-temp-buffer
		(setq tmp-name (tramp--test-make-temp-name local quoted))
		(write-region "foo" nil tmp-name)
		(should (file-exists-p tmp-name))
		(should (zerop (process-file "cat" tmp-name t)))
		(should (string-equal "foo" (buffer-string)))
		(should-not (get-buffer-window (current-buffer) t))
		(delete-file tmp-name)))

	    ;; Check remote and local DESTINATION file.  This isn't
	    ;; implemented yet in all file name handler backends.
	    ;; (dolist (local '(nil t))
	    ;;   (setq tmp-name (tramp--test-make-temp-name local quoted))
	    ;;   (should
	    ;;    (zerop (process-file "echo" nil `(:file ,tmp-name) nil "foo")))
	    ;;   (with-temp-buffer
	    ;; 	(insert-file-contents tmp-name)
	    ;; 	(should (string-equal "foo" (buffer-string)))
	    ;; 	(should-not (get-buffer-window (current-buffer) t))
	    ;; 	(delete-file tmp-name)))

	    ;; Check remote and local STDERR.
	    (dolist (local '(nil t))
	      (setq tmp-name (tramp--test-make-temp-name local quoted))
	      (should-not
	       (zerop
		(process-file "cat" nil `(t ,tmp-name) nil "/does-not-exist")))
	      (with-temp-buffer
		(insert-file-contents tmp-name)
		(should
		 (string-match-p
		  (rx "cat:" (* nonl) " No such file or directory")
		  (buffer-string)))
		(should-not (get-buffer-window (current-buffer) t))
		(delete-file tmp-name))))

	;; Cleanup.
	(ignore-errors (kill-buffer buffer))
	(ignore-errors (delete-file tmp-name))))))

;; Must be a command, because used as `sigusr1' handler.
(defun tramp--test-timeout-handler (&rest _ignore)
  "Timeout handler, reporting a failed test."
  (interactive)
  (tramp--test-message "proc: %s" (get-buffer-process (current-buffer)))
  (when-let ((proc (get-buffer-process (current-buffer)))
	     ((processp proc)))
    (tramp--test-message "cmd: %s" (process-command proc)))
  (tramp--test-message "buf: %s\n%s\n---" (current-buffer) (buffer-string))
  (ert-fail (format "`%s' timed out" (ert-test-name (ert-running-test)))))

(ert-deftest tramp-test29-start-file-process ()
  "Check `start-file-process'."
  :tags '(:expensive-test :tramp-asynchronous-processes)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((default-directory ert-remote-temporary-file-directory)
	  (tmp-name (tramp--test-make-temp-name nil quoted))
	  kill-buffer-query-functions command proc)

      ;; Simple process.
      (unwind-protect
	  (with-temp-buffer
	    (setq command '("cat")
		  proc
		  (apply #'start-file-process "test1" (current-buffer) command))
	    (should (processp proc))
	    (should (equal (process-status proc) 'run))
	    (should (equal (process-get proc 'remote-command) command))
	    (process-send-string proc "foo\n")
	    (process-send-eof proc)
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (< (- (point-max) (point-min)) (length "foo"))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors (delete-process proc)))

      ;; Simple process using a file.
      (unwind-protect
	  (with-temp-buffer
	    (write-region "foo" nil tmp-name)
	    (should (file-exists-p tmp-name))
	    (setq command `("cat" ,(file-name-nondirectory tmp-name))
		  proc
		  (apply #'start-file-process "test2" (current-buffer) command))
	    (should (processp proc))
	    (should (equal (process-get proc 'remote-command) command))
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (< (- (point-max) (point-min)) (length "foo"))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors
	  (delete-process proc)
	  (delete-file tmp-name)))

      ;; Process filter.
      (unwind-protect
	  (with-temp-buffer
	    (setq command '("cat")
		  proc
		  (apply #'start-file-process "test3" (current-buffer) command))
	    (should (processp proc))
	    (should (equal (process-status proc) 'run))
	    (should (equal (process-get proc 'remote-command) command))
	    (set-process-filter
	     proc
	     (lambda (p s) (with-current-buffer (process-buffer p) (insert s))))
	    (process-send-string proc "foo\n")
	    (process-send-eof proc)
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (< (- (point-max) (point-min)) (length "foo"))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors (delete-process proc)))

      ;; Disabled process filter.  It doesn't work reliable.
      (unless t
	(unwind-protect
	    (with-temp-buffer
	      (setq command '("cat")
		    proc
		    (apply
		     #'start-file-process "test4" (current-buffer) command))
	      (should (processp proc))
	      (should (equal (process-status proc) 'run))
	      (should (equal (process-get proc 'remote-command) command))
	      (set-process-filter proc t)
	      (process-send-string proc "foo\n")
	      (process-send-eof proc)
	      ;; Read output.  There shouldn't be any.
	      (with-timeout (10)
		(while (process-live-p proc)
		  (while (accept-process-output proc 0 nil t))))
	      ;; No output due to process filter.
	      (should (= (point-min) (point-max))))

	  ;; Cleanup.
	  (ignore-errors (delete-process proc))))

      ;; Process connection type.
      (when (and (tramp--test-sh-p)
		 (not (tramp-direct-async-process-p))
		 (executable-find "hexdump" 'remote))
	(dolist (process-connection-type '(nil pipe t pty))
	  (unwind-protect
	      (with-temp-buffer
		(setq command '("hexdump" "-v" "-e" "/1 \"%02X\n\"")
		      proc
		      (apply #'start-file-process
			     (format "test5-%s" process-connection-type)
			     (current-buffer) command))
		(should (processp proc))
		(should (equal (process-status proc) 'run))
		(should (equal (process-get proc 'remote-command) command))
		;; Give the pipe process a chance to start.
		(when (memq process-connection-type '(nil pipe))
		  (sit-for 0.1 'nodisp))
		(process-send-string proc "foo\r\n")
		(process-send-eof proc)
		;; Read output.  On macOS, there is always newline
                ;; conversion.  "telnet" converts \r to <CR><NUL> if
                ;; `crlf' flag is FALSE.  See telnet(1) man page.
		(let ((expected
		       (rx "66\n" "6F\n" "6F\n"
			   (| "0D\n" "0A\n") (? "00\n") "0A\n")))
		  (with-timeout (10 (tramp--test-timeout-handler))
		    (while (not (string-match-p expected (buffer-string)))
		      (while (accept-process-output proc 0 nil t))))
		  (should (string-match-p expected (buffer-string)))))

	    ;; Cleanup.
	    (ignore-errors (delete-process proc)))))

      ;; PTY.
      (unwind-protect
	  (with-temp-buffer
	    ;; It works only for tramp-sh.el, and not direct async processes.
	    (if (or (not (tramp--test-sh-p)) (tramp-direct-async-process-p))
		(should-error
		 (start-file-process "test6" (current-buffer) nil)
		 :type 'wrong-type-argument)

	      (setq proc (start-file-process "test6" (current-buffer) nil))
	      (should (processp proc))
	      (should (equal (process-status proc) 'run))
	      (should-not (process-get proc 'remote-command))
	      ;; On MS Windows, `process-tty-name' returns nil.
	      (unless (tramp--test-windows-nt-p)
		(should (stringp (process-tty-name proc))))))

	;; Cleanup.
	(ignore-errors (delete-process proc))))))

(defmacro tramp--test-deftest-direct-async-process (test &optional unstable)
  "Define ert test `TEST-direct-async' for direct async processes.
If UNSTABLE is non-nil, the test is tagged as `:unstable'."
  (declare (indent 1))
  `(ert-deftest ,(intern (concat (symbol-name test) "-direct-async")) ()
     ;; This is the docstring.  However, it must be expanded to a
     ;; string inside the macro.  No idea.
     ;; (concat (ert-test-documentation (get ',test 'ert--test))
     ;;         "\nUse direct async process.")
     :tags (append '(:expensive-test :tramp-asynchronous-processes)
		   (and ,unstable '(:unstable)))
     (skip-unless (tramp--test-enabled))
     (let* ((default-directory ert-remote-temporary-file-directory)
	    (ert-test (ert-get-test ',test))
	    (connection-local-profile-alist
	     (cons
	      '(direct-async-process-profile (tramp-direct-async-process . t))
	      connection-local-profile-alist))
	    (connection-local-criteria-alist
	     (cons
	      `((:application tramp
		 :machine ,(file-remote-p default-directory 'host))
		direct-async-process-profile)
	      connection-local-criteria-alist)))
       (skip-unless (tramp-direct-async-process-p))
       ;; We do expect an established connection already,
       ;; `file-truename' does it by side-effect.  Suppress
       ;; `tramp--test-enabled', in order to keep the connection.
       (cl-letf (((symbol-function #'tramp--test-enabled) #'tramp-compat-always))
	 (file-truename ert-remote-temporary-file-directory)
	 (funcall (ert-test-body ert-test))))))

(tramp--test-deftest-direct-async-process tramp-test29-start-file-process)

(ert-deftest tramp-test30-make-process ()
  "Check `make-process'."
  :tags (append '(:expensive-test :tramp-asynchronous-processes)
		(and (getenv "EMACS_EMBA_CI")
                     '(:unstable)))
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((default-directory ert-remote-temporary-file-directory)
	  (tmp-name (tramp--test-make-temp-name nil quoted))
	  kill-buffer-query-functions command proc)
      (should-not (apply #'make-process nil)) ; Use `apply' to avoid warnings.

      ;; Simple process.
      (unwind-protect
	  (with-temp-buffer
	    (setq command '("cat")
		  proc
		  (make-process
		   :name "test1" :buffer (current-buffer) :command command
		   :file-handler t))
	    (should (processp proc))
	    (should (equal (process-status proc) 'run))
	    (should (equal (process-get proc 'remote-command) command))
	    (process-send-string proc "foo\n")
	    (process-send-eof proc)
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (< (- (point-max) (point-min)) (length "foo"))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors (delete-process proc)))

      ;; Simple process using a file.
      (unwind-protect
	  (with-temp-buffer
	    (write-region "foo" nil tmp-name)
	    (should (file-exists-p tmp-name))
	    (setq command `("cat" ,(file-name-nondirectory tmp-name))
		  proc
		  (make-process
		   :name "test2" :buffer (current-buffer) :command command
		   :file-handler t))
	    (should (processp proc))
	    (should (equal (process-get proc 'remote-command) command))
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (< (- (point-max) (point-min)) (length "foo"))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors
	  (delete-process proc)
	  (delete-file tmp-name)))

      ;; Process filter.
      (unwind-protect
	  (with-temp-buffer
	    (setq command '("cat")
		  proc
		  (make-process
		   :name "test3" :buffer (current-buffer) :command command
		   :filter
		   (lambda (p s)
		     (with-current-buffer (process-buffer p) (insert s)))
		   :file-handler t))
	    (should (processp proc))
	    (should (equal (process-status proc) 'run))
	    (should (equal (process-get proc 'remote-command) command))
	    (process-send-string proc "foo\n")
	    (process-send-eof proc)
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (not (string-match-p "foo" (buffer-string)))
		(while (accept-process-output proc 0 nil t))))
	    (should (string-match-p "foo" (buffer-string))))

	;; Cleanup.
	(ignore-errors (delete-process proc)))

      ;; Disabled process filter.  It doesn't work reliable.
      (unless t
	(unwind-protect
	    (with-temp-buffer
	      (setq command '("cat")
		    proc
		    (make-process
		     :name "test4" :buffer (current-buffer) :command command
		     :filter t :file-handler t))
	      (should (processp proc))
	      (should (equal (process-status proc) 'run))
	      (should (equal (process-get proc 'remote-command) command))
	      (process-send-string proc "foo\n")
	      (process-send-eof proc)
	      ;; Read output.  There shouldn't be any.
	      (with-timeout (10)
		(while (process-live-p proc)
		  (while (accept-process-output proc 0 nil t))))
	      ;; No output due to process filter.
	      (should (= (point-min) (point-max))))

	  ;; Cleanup.
	  (ignore-errors (delete-process proc))))

      ;; Process sentinel.
      (unwind-protect
	  (with-temp-buffer
	    (setq command '("cat")
		  proc
		  (make-process
		   :name "test5" :buffer (current-buffer) :command command
		   :sentinel
		   (lambda (p s)
		     (with-current-buffer (process-buffer p) (insert s)))
		   :file-handler t))
	    (should (processp proc))
	    (should (equal (process-status proc) 'run))
	    (should (equal (process-get proc 'remote-command) command))
	    (process-send-string proc "foo\n")
	    (process-send-eof proc)
	    (delete-process proc)
	    ;; Read output.
	    (with-timeout (10 (tramp--test-timeout-handler))
	      (while (accept-process-output proc 0 nil t)))
	    ;; On some MS Windows systems, it returns "unknown signal".
	    (should
	     (string-match-p
	      (rx (| "unknown signal" "killed")) (buffer-string))))

	;; Cleanup.
	(ignore-errors (delete-process proc)))

      ;; Process with stderr buffer.  "telnet" does not cooperate with
      ;; three processes.
      (unless (or (tramp--test-telnet-p) (tramp-direct-async-process-p))
	(let ((stderr (generate-new-buffer "*stderr*")))
	  (unwind-protect
	      (with-temp-buffer
		(setq command '("cat" "/does-not-exist")
		      proc
		      (make-process
		       :name "test6" :buffer (current-buffer) :command  command
		       :stderr stderr :file-handler t))
		(should (processp proc))
		(should (equal (process-get proc 'remote-command) command))
		;; Read output.
		(with-timeout (10 (tramp--test-timeout-handler))
		  (while (accept-process-output proc 0 nil t)))
		;; Read stderr.
		(with-current-buffer stderr
		  (with-timeout (10 (tramp--test-timeout-handler))
		    (while (not (string-match-p
				 "No such file or directory" (buffer-string)))
		      (while (accept-process-output
			      (get-buffer-process stderr) 0 nil t))))
		  (delete-process proc)
		  (should
		   (string-match-p
		    (rx "cat:" (* nonl) " No such file or directory")
		    (buffer-string)))))

	    ;; Cleanup.
	    (ignore-errors (delete-process proc))
	    (ignore-errors (kill-buffer stderr)))))

      ;; Process with stderr file.
      (unless (tramp-direct-async-process-p)
	(unwind-protect
	    (with-temp-buffer
	      (setq command '("cat" "/does-not-exist")
		    proc
		    (make-process
		     :name "test7" :buffer (current-buffer) :command command
		     :stderr tmp-name :file-handler t))
	      (should (processp proc))
	      (should (equal (process-get proc 'remote-command) command))
	      ;; Read stderr.
	      (with-timeout (10 (tramp--test-timeout-handler))
		(while (accept-process-output proc nil nil t)))
	      (delete-process proc)
	      (with-temp-buffer
		(insert-file-contents tmp-name)
		(should
		 (string-match-p
		  (rx "cat:" (* nonl) " No such file or directory")
		  (buffer-string)))))

	  ;; Cleanup.
	  (ignore-errors (delete-process proc))
	  (ignore-errors (delete-file tmp-name))))

      ;; Process connection type.
      (when (and (tramp--test-sh-p)
		 (not (tramp-direct-async-process-p))
		 (executable-find "hexdump" 'remote))
	(dolist (connection-type '(nil pipe t pty))
	  ;; `process-connection-type' is taken when
	  ;; `:connection-type' is nil.
	  (dolist (process-connection-type
		   (if connection-type '(nil pipe t pty) '(nil)))
	    (unwind-protect
		(with-temp-buffer
		  (setq command '("hexdump" "-v" "-e" "/1 \"%02X\n\"")
			proc
			(make-process
			 :name
			 (format "test8-%s-%s"
				 connection-type process-connection-type)
			 :buffer (current-buffer)
			 :connection-type connection-type
			 :command command
			 :file-handler t))
		  (should (processp proc))
		  (should (equal (process-status proc) 'run))
		  (should (equal (process-get proc 'remote-command) command))
		  ;; Give the pipe process a chance to start.
		  (when (or (eq connection-type 'pipe)
			    (memq process-connection-type '(nil pipe)))
		    (sit-for 0.1 'nodisp))
		  (process-send-string proc "foo\r\n")
		  (process-send-eof proc)
		  ;; Read output.  On macOS, there is always newline
                  ;; conversion.  "telnet" converts \r to <CR><NUL> if
                  ;; `crlf' flag is FALSE.  See telnet(1) man page.
		  (let ((expected
			 (rx "66\n" "6F\n" "6F\n"
			     (| "0D\n" "0A\n") (? "00\n") "0A\n")))
		    (with-timeout (10 (tramp--test-timeout-handler))
		      (while (not (string-match-p expected (buffer-string)))
			(while (accept-process-output proc 0 nil t))))
		    (should (string-match-p expected (buffer-string)))))

	      ;; Cleanup.
	      (ignore-errors (delete-process proc)))))))))

(tramp--test-deftest-direct-async-process tramp-test30-make-process)

(ert-deftest tramp-test31-interrupt-process ()
  "Check `interrupt-process'."
  ;; The final `process-live-p' check does not run sufficiently.
  :tags '(:expensive-test :tramp-asynchronous-processes :unstable)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-windows-nt-p)))
  (skip-unless (not (tramp--test-crypt-p)))

  ;; We must use `file-truename' for the temporary directory, in
  ;; order to establish the connection prior running an asynchronous
  ;; process.
  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
	(delete-exited-processes t)
	kill-buffer-query-functions command proc)
    (unwind-protect
	(with-temp-buffer
	  (setq command "trap 'echo boom; exit 1' 2; sleep 100"
		proc (start-file-process-shell-command
		      "test" (current-buffer) command))
	  (should (processp proc))
	  (should (process-live-p proc))
	  (should (equal (process-status proc) 'run))
	  (should (numberp (process-get proc 'remote-pid)))
	  (should (equal (process-get proc 'remote-command)
			 (with-connection-local-variables
			  `(,shell-file-name ,shell-command-switch ,command))))
	  (should (interrupt-process proc))
	  ;; Let the process accept the interrupt.
	  (with-timeout (10 (tramp--test-timeout-handler))
	    (while (process-live-p proc)
	      (while (accept-process-output proc 0 nil t))))
	  (should-not (process-live-p proc))
	  ;; An interrupted process cannot be interrupted, again.
	  (should-error
	   (interrupt-process proc)
	   :type 'error))

      ;; Cleanup.
      (ignore-errors (delete-process proc)))))

(ert-deftest tramp-test31-signal-process ()
  "Check `signal-process'."
  ;; The final `process-live-p' check does not run sufficiently.
  :tags '(:expensive-test :tramp-asynchronous-processes :unstable)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-windows-nt-p)))
  (skip-unless (not (tramp--test-crypt-p)))
  ;; Since Emacs 29.1.
  (skip-unless (boundp 'signal-process-functions))

  ;; We must use `file-truename' for the temporary directory, in
  ;; order to establish the connection prior running an asynchronous
  ;; process.
  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
	(delete-exited-processes t)
	kill-buffer-query-functions command proc)

    ;; If PROCESS is a string, it must be a process name or a process
    ;; number.  Check error handling.
    (should-error
     (signal-process (md5 (current-time-string)) 0)
     :type 'wrong-type-argument)

    ;; The PROCESS argument of `signal-process' can be a string.  Test
    ;; this as well.
    (dolist
	(func '(identity
		(lambda (x) (format "%s" (if (processp x) (process-name x) x)))))
      (dolist (sigcode '(2 INT))
	(unwind-protect
	    (with-temp-buffer
	      (setq command "trap 'echo boom; exit 1' 2; sleep 100"
		    proc (start-file-process-shell-command
		          (format "test1-%s" sigcode) (current-buffer) command))
	      (should (processp proc))
	      (should (process-live-p proc))
	      (should (equal (process-status proc) 'run))
	      (should (numberp (process-get proc 'remote-pid)))
	      (should
	       (equal (process-get proc 'remote-command)
		      (with-connection-local-variables
		       `(,shell-file-name ,shell-command-switch ,command))))
	      (should (zerop (signal-process (funcall func proc) sigcode)))
	      ;; Let the process accept the signal.
	      (with-timeout (10 (tramp--test-timeout-handler))
		(while (accept-process-output proc 0 nil t)))
              (should-not (process-live-p proc)))

          ;; Cleanup.
          (ignore-errors (kill-process proc))
          (ignore-errors (delete-process proc)))

	(unwind-protect
	    (with-temp-buffer
	      (setq command "trap 'echo boom; exit 1' 2; sleep 100"
		    proc (start-file-process-shell-command
		          (format "test2-%s" sigcode) (current-buffer) command))
	      (should (processp proc))
	      (should (process-live-p proc))
	      (should (equal (process-status proc) 'run))
	      (should (numberp (process-get proc 'remote-pid)))
	      (should
	       (equal (process-get proc 'remote-command)
		      (with-connection-local-variables
		       `(,shell-file-name ,shell-command-switch ,command))))
	      ;; `signal-process' has argument REMOTE since Emacs 29.
	      (with-no-warnings
		(should
		 (zerop
		  (signal-process
		   (funcall func (process-get proc 'remote-pid))
		   sigcode default-directory))))
	      ;; Let the process accept the signal.
	      (with-timeout (10 (tramp--test-timeout-handler))
		(while (accept-process-output proc 0 nil t)))
              (should-not (process-live-p proc)))

          ;; Cleanup.
          (ignore-errors (kill-process proc))
          (ignore-errors (delete-process proc)))))))

(ert-deftest tramp-test31-list-system-processes ()
  "Check `list-system-processes'."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))
  ;; `list-system-processes' is supported since Emacs 29.1.
  (skip-unless (tramp--test-emacs29-p))

  (let ((default-directory ert-remote-temporary-file-directory))
    (skip-unless (consp (list-system-processes)))
    (should (not (equal (list-system-processes)
			(let ((default-directory temporary-file-directory))
			  (list-system-processes)))))))

(ert-deftest tramp-test31-process-attributes ()
  "Check `process-attributes'."
  :tags '(:expensive-test :tramp-asynchronous-processes)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))
  ;; `process-attributes' is supported since Emacs 29.1.
  (skip-unless (tramp--test-emacs29-p))

  ;; We must use `file-truename' for the temporary directory, in
  ;; order to establish the connection prior running an asynchronous
  ;; process.
  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
	(delete-exited-processes t)
	kill-buffer-query-functions command proc)
    (skip-unless (consp (list-system-processes)))

    (unwind-protect
	(progn
	  (setq command '("sleep" "100")
		proc (apply #'start-file-process "test" nil command))
	  (while (accept-process-output proc 0))
	  (when-let ((pid (process-get proc 'remote-pid))
		     (attributes (process-attributes pid)))
	    ;; (tramp--test-message "%s" attributes)
	    (should (equal (cdr (assq 'comm attributes)) (car command)))
	    (should (equal (cdr (assq 'args attributes))
			   (string-join command " ")))))

      ;; Cleanup.
      (ignore-errors (delete-process proc)))))

(ert-deftest tramp-test31-memory-info ()
  "Check `memory-info'."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))
  ;; `memory-info' is supported since Emacs 29.1.
  (skip-unless (tramp--test-emacs29-p))

  (when-let ((default-directory ert-remote-temporary-file-directory)
             (mi (memory-info)))
    (should (consp mi))
    (should (tramp-compat-length= mi 4))
    (dotimes (i (length mi))
      (should (natnump (nth i mi))))))

(defun tramp--test-async-shell-command
    (command output-buffer &optional error-buffer input)
  "Like `async-shell-command', reading the output.
INPUT, if non-nil, is a string sent to the process."
  (let ((proc (async-shell-command command output-buffer error-buffer))
	(delete-exited-processes t))
    (should (equal (process-get proc 'remote-command)
		   (with-connection-local-variables
		    `(,shell-file-name ,shell-command-switch ,command))))
    (cl-letf (((symbol-function #'shell-command-sentinel) #'ignore))
      (when (stringp input)
	(process-send-string proc input))
      (with-timeout
	  ((if (getenv "EMACS_EMBA_CI") 30 10) (tramp--test-timeout-handler))
	(while
	    (or (accept-process-output proc nil nil t) (process-live-p proc))))
      (accept-process-output proc nil nil t))))

(defun tramp--test-shell-command-to-string-asynchronously (command)
  "Like `shell-command-to-string', but for asynchronous processes."
  (with-temp-buffer
    (tramp--test-async-shell-command command (current-buffer))
    (buffer-substring-no-properties (point-min) (point-max))))

(ert-deftest tramp-test32-shell-command ()
  "Check `shell-command'."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name (tramp--test-make-temp-name nil quoted))
	  (default-directory ert-remote-temporary-file-directory)
	  ;; Suppress nasty messages.
	  (inhibit-message t)
	  kill-buffer-query-functions)

      (dolist (this-shell-command
	       (append
		;; Synchronously.
		'(shell-command)
		;; Asynchronously.
		(and (tramp--test-asynchronous-processes-p)
		     '(tramp--test-async-shell-command))))

	;; Test ordinary `{async-}shell-command'.
	(unwind-protect
	    (with-temp-buffer
	      (write-region "foo" nil tmp-name)
	      (should (file-exists-p tmp-name))
	      (funcall
	       this-shell-command
	       (format "ls %s" (file-name-nondirectory tmp-name))
	       (current-buffer))
	      ;; "ls" could produce colorized output.
	      (goto-char (point-min))
	      (while (search-forward-regexp ansi-color-control-seq-regexp nil t)
		(replace-match "" nil nil))
	      (should
	       (string-equal
		(format "%s\n" (file-name-nondirectory tmp-name))
		(buffer-string))))

	  ;; Cleanup.
	  (ignore-errors (delete-file tmp-name)))

	;; Test `{async-}shell-command' with error buffer.
	(unless (tramp-direct-async-process-p)
	  (let ((stderr (generate-new-buffer "*stderr*")))
	    (unwind-protect
		(with-temp-buffer
		  (funcall
		   this-shell-command
		   "echo foo >&2; echo bar" (current-buffer) stderr)
		  (should (string-equal "bar\n" (buffer-string)))
		  ;; Check stderr.
		  (should
		   (string-equal "foo\n" (tramp-get-buffer-string stderr))))

	      ;; Cleanup.
	      (ignore-errors (kill-buffer stderr))))))

      ;; Test sending string to `async-shell-command'.
      (when (tramp--test-asynchronous-processes-p)
	(unwind-protect
	    (with-temp-buffer
	      (write-region "foo" nil tmp-name)
	      (should (file-exists-p tmp-name))
	      (tramp--test-async-shell-command
	       "read line; ls $line" (current-buffer) nil
	       ;; String to be sent.
	       (format "%s\n" (file-name-nondirectory tmp-name)))
	      (should
	       (string-match-p
		;; Some shells echo, for example the "adb" or container methods.
		(rx
		 bos (** 1 2 (literal (file-name-nondirectory tmp-name)) "\n")
		 eos)
		(buffer-string))))

	  ;; Cleanup.
	  (ignore-errors (delete-file tmp-name))))))

  ;; Test `async-shell-command-width'.
  (when (and (tramp--test-asynchronous-processes-p) (tramp--test-sh-p))
    (let* ((async-shell-command-width 1024)
	   (default-directory ert-remote-temporary-file-directory)
	   (cols (ignore-errors
		   (read (tramp--test-shell-command-to-string-asynchronously
			  "tput cols")))))
      (when (natnump cols)
	(should (= cols async-shell-command-width))))))

(tramp--test-deftest-direct-async-process tramp-test32-shell-command)

;; This test is inspired by Bug#39067.
(ert-deftest tramp-test32-shell-command-dont-erase-buffer ()
  "Check `shell-command-dont-erase-buffer'."
  ;; As long as Bug#40896 is not solved both in simple.el and Tramp,
  ;; this test cannot run properly.
  :tags '(:expensive-test :unstable)
  (skip-unless (tramp--test-enabled))
  (skip-unless nil)
  (skip-unless (tramp--test-supports-processes-p))

  ;; (message "   s-c-d-e-b current-buffer buffer-string point")
  ;; (message "===============================================")

  ;;    s-c-d-e-b current-buffer buffer-string point
  ;; ===============================================
  ;;          nil              t    foobazzbar     4 x
  ;;          nil            nil          bazz     5
  ;; -----------------------------------------------
  ;;        erase              t          bazz     1 x
  ;;        erase            nil          bazz     5
  ;; -----------------------------------------------
  ;; beg-last-out              t    foobazzbar     4 x
  ;; beg-last-out            nil    foobarbazz     7
  ;; -----------------------------------------------
  ;; end-last-out              t    foobazzbar     4
  ;; end-last-out            nil    foobazzbar    11
  ;; -----------------------------------------------
  ;;   save-point              t    foobazzbar     4 x
  ;;   save-point            nil    foobarbazz     4 x
  ;; -----------------------------------------------
  ;;       random              t    foobazzbar     4
  ;;       random            nil    foobazzbar    11
  ;; -----------------------------------------------

  (let (;; Suppress nasty messages.
	(inhibit-message t)
	buffer kill-buffer-query-functions)
    ;; We check both the local and remote case, in order to guarantee
    ;; that they behave similar.
    (dolist (default-directory
	      `(,temporary-file-directory ,ert-remote-temporary-file-directory))
      ;; These are the possible values of `shell-command-dont-erase-buffer'.
      ;; `random' is taken as non-nil value without special meaning.
      (dolist (shell-command-dont-erase-buffer
	       '(nil erase beg-last-out end-last-out save-point random))
	;; `shell-command' might work over the current buffer, or not.
	(dolist (current '(t nil))
	  (with-temp-buffer
	    ;; We insert the string "foobar" into an empty buffer.
	    ;; Point is set between "foo" and "bar".
	    (setq buffer (current-buffer))
	    (insert "foobar")
	    (goto-char (- (point) 3))
	    (should (string-equal "foobar" (buffer-string)))
	    (should (string-equal "foo" (buffer-substring (point-min) (point))))
	    (should (string-equal "bar" (buffer-substring (point) (point-max))))

	    ;; Apply `shell-command'.  It shall output the string
	    ;; "bazz".  Messages in the *Messages* buffer are
	    ;; suppressed.
            (let (message-log-max)
	      (if current
		  (shell-command "echo -n bazz" (current-buffer))
		(with-temp-buffer (shell-command "echo -n bazz" buffer))))

	  ;;   (message
	  ;;    "%12s %14s %13s %5d"
	  ;;    shell-command-dont-erase-buffer current (buffer-string) (point))))
	  ;; (message "-----------------------------------------------")))))

	    ;; Check result.
	    (cond
	     (current
	      ;; String is inserted at point, and point is preserved
	      ;; unless dictated otherwise.
	      (cond
	       ((null shell-command-dont-erase-buffer)
		(should (string-equal "foobazzbar" (buffer-string)))
		(should (= 4 (point))))
	       ((eq shell-command-dont-erase-buffer 'erase)
		(should (string-equal "bazz" (buffer-string)))
		(should (= 1 (point))))
	       ((eq shell-command-dont-erase-buffer 'beg-last-out)
		(should (string-equal "foobazzbar" (buffer-string)))
		(should (= 4 (point))))
	       ;; Bug#40896
	       ;; ((eq shell-command-dont-erase-buffer 'end-last-out)
	       ;; 	(should (string-equal "foobazzbar" (buffer-string)))
	       ;; 	(should (= 7 (point))))
	       ((eq shell-command-dont-erase-buffer 'save-point)
		(should (string-equal "foobazzbar" (buffer-string)))
		(should (= 4 (point))))
	       ;; Bug#40896
	       ;; ((eq shell-command-dont-erase-buffer 'random)
	       ;; 	(should (string-equal "foobazzbar" (buffer-string)))
	       ;; 	(should (= 7 (point))))))
	       ))

	     (t ;; not current buffer
	      ;; String is appended, and point is at point-max unless
	      ;; dictated otherwise.
	      (cond
	       ((null shell-command-dont-erase-buffer)
		(should (string-equal "bazz" (buffer-string)))
		(should (= 5 (point))))
	       ((eq shell-command-dont-erase-buffer 'erase)
		(should (string-equal "bazz" (buffer-string)))
		(should (= 5 (point))))
	       ((eq shell-command-dont-erase-buffer 'beg-last-out)
		(should (string-equal "foobarbazz" (buffer-string)))
		(should (= 7 (point))))
	       ;; ;; Bug#40896
	       ;; ((eq shell-command-dont-erase-buffer 'end-last-out)
	       ;; 	(should (string-equal "foobarbazz" (buffer-string)))
	       ;; 	(should (= 11 (point))))
	       ((eq shell-command-dont-erase-buffer 'save-point)
		(should (string-equal "foobarbazz" (buffer-string)))
		(should (= 4 (point))))
	       ;; ;; Bug#40896
	       ;; ((eq shell-command-dont-erase-buffer 'random)
	       ;; 	(should (string-equal "foobarbazz" (buffer-string)))
	       ;; 	(should (= 11 (point)))))))))))))
	       )))))))))

;; This test is inspired by Bug#23952.
(ert-deftest tramp-test33-environment-variables ()
  "Check that remote processes set / unset environment variables properly."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-crypt-p)))

  (dolist (this-shell-command-to-string
	   (append
	    ;; Synchronously.
	    '(shell-command-to-string)
	    ;; Asynchronously.
	    (and (tramp--test-asynchronous-processes-p)
		 '(tramp--test-shell-command-to-string-asynchronously))))

    (let ((default-directory ert-remote-temporary-file-directory)
	  (shell-file-name "/bin/sh")
	  (envvar (concat "VAR_" (upcase (md5 (current-time-string)))))
	  kill-buffer-query-functions)

      ;; Check INSIDE_EMACS.
      (setenv "INSIDE_EMACS")
      (should
       (string-equal
	(format "%s,tramp:%s\n" emacs-version tramp-version)
	(funcall this-shell-command-to-string "echo \"${INSIDE_EMACS:-bla}\"")))
      (let ((process-environment
	     (cons (format "INSIDE_EMACS=%s,foo" emacs-version)
		   process-environment)))
	(should
	 (string-equal
	  (format "%s,foo,tramp:%s\n" emacs-version tramp-version)
	  (funcall
	   this-shell-command-to-string "echo \"${INSIDE_EMACS:-bla}\""))))

      ;; Set a value.
      (let ((process-environment
	     (cons (concat envvar "=foo") process-environment)))
	;; Default value.
	(should
	 (string-match-p
	  "foo"
	  (funcall
	   this-shell-command-to-string
	   (format "echo \"${%s:-bla}\"" envvar)))))

      ;; Set the empty value.
      (let ((process-environment
	     (cons (concat envvar "=") process-environment)))
	;; Value is null.
	(should
	 (string-match-p
	  "bla"
	  (funcall
	   this-shell-command-to-string (format "echo \"${%s:-bla}\"" envvar))))
	;; Variable is set.
	(should
	 (string-match-p
	  (rx (literal envvar)) (funcall this-shell-command-to-string "set"))))

      (unless (tramp-direct-async-process-p)
	;; We force a reconnect, in order to have a clean environment.
	(tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	;; Unset the variable.
	(let ((tramp-remote-process-environment
	       (cons (concat envvar "=foo") tramp-remote-process-environment)))
	  ;; Refill the cache; we don't want to run into timeouts.
	  (file-truename default-directory)
	  ;; Check the initial value, we want to unset below.
	  (should
	   (string-match-p
	    "foo"
	    (funcall
	     this-shell-command-to-string
	     (format "echo \"${%s:-bla}\"" envvar))))
	  (let ((process-environment (cons envvar process-environment)))
	    ;; Variable is unset.
	    (should
	     (string-match-p
	      "bla"
	      (funcall
	       this-shell-command-to-string
	       (format "echo \"${%s:-bla}\"" envvar))))
	    ;; Variable is unset.
	    (should-not
	     (string-match-p
	      (rx (literal envvar))
	      ;; We must remove PS1, the output is truncated otherwise.
	      ;; We must suppress "_=VAR...".
	      (funcall
	       this-shell-command-to-string
	       "printenv | grep -v PS1 | grep -v _=")))))))))

(tramp--test-deftest-direct-async-process tramp-test33-environment-variables)

;; This test is inspired by Bug#27009.
(ert-deftest tramp-test33-environment-variables-and-port-numbers ()
  "Check that two connections with separate ports are different."
  (skip-unless (tramp--test-enabled))
  ;; We test it only for the mock-up connection; otherwise there might
  ;; be problems with the used ports.
  (skip-unless (and (eq tramp-syntax 'default) (tramp--test-mock-p)))
  (skip-unless (not (tramp--test-crypt-p)))

  ;; We force a reconnect, in order to have a clean environment.
  (dolist (dir `(,ert-remote-temporary-file-directory
		 "/mock:localhost#11111:" "/mock:localhost#22222:"))
    (tramp-cleanup-connection
     (tramp-dissect-file-name dir) 'keep-debug 'keep-password))

  (unwind-protect
      (dolist (port '(11111 22222))
	(let* ((default-directory
		 (format "/mock:localhost#%d:%s" port temporary-file-directory))
	       (shell-file-name "/bin/sh")
	       (envvar (concat "VAR_" (upcase (md5 (current-time-string)))))
	       ;; We cannot use `process-environment', because this
	       ;; would be applied in `process-file'.
	       (tramp-remote-process-environment
		(cons
		 (format "%s=%d" envvar port)
		 tramp-remote-process-environment)))
	  (should
	   (string-match-p
	    (number-to-string port)
	    (shell-command-to-string (format "echo $%s" envvar))))))

    ;; Cleanup.
    (dolist (dir '("/mock:localhost#11111:" "/mock:localhost#22222:"))
      (tramp-cleanup-connection (tramp-dissect-file-name dir)))))

(ert-deftest tramp-test34-connection-local-variables ()
  "Check that connection-local variables are enabled."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))

  (let* ((default-directory ert-remote-temporary-file-directory)
	 (tmp-name1 (tramp--test-make-temp-name))
	 (tmp-name2 (expand-file-name "foo" tmp-name1))
	 (enable-local-variables :all)
	 (enable-remote-dir-locals t)
         (inhibit-message t)
	 kill-buffer-query-functions
	 (clpa connection-local-profile-alist)
	 (clca connection-local-criteria-alist))
    (unwind-protect
	(progn
	  (make-directory tmp-name1)
          (should (file-directory-p tmp-name1))

	  ;; `local-variable' is buffer-local due to explicit setting.
	  ;; We need `with-no-warnings', because `defvar-local' is not
	  ;; called at toplevel.
	  (with-no-warnings
	   (defvar-local local-variable 'buffer))
	  (with-temp-buffer
	    (should (eq local-variable 'buffer)))

	  ;; `local-variable' is connection-local due to Tramp.
	  (write-region "foo" nil tmp-name2)
	  (should (file-exists-p tmp-name2))
	  (connection-local-set-profile-variables
	   'local-variable-profile
	   '((local-variable . connect)))
	  (connection-local-set-profiles
	   `(:application tramp
	     :protocol ,(file-remote-p default-directory 'method)
	     :user ,(file-remote-p default-directory 'user)
	     :machine ,(file-remote-p default-directory 'host))
	   'local-variable-profile)
	  (with-current-buffer (find-file-noselect tmp-name2)
	    (should (eq local-variable 'connect))
	    (kill-buffer (current-buffer)))

	  ;; `local-variable' is still connection-local due to Tramp.
	  ;; `find-file-hook' overrides dir-local settings.
	  (write-region
	   "((nil . ((local-variable . dir))))" nil
	   (expand-file-name ".dir-locals.el" tmp-name1))
	  (should (file-exists-p (expand-file-name ".dir-locals.el" tmp-name1)))
	  (when (memq #'tramp-set-connection-local-variables-for-buffer
		      find-file-hook)
	    (with-current-buffer (find-file-noselect tmp-name2)
	      (should (eq local-variable 'connect))
	      (kill-buffer (current-buffer))))
	  ;; `local-variable' is dir-local due to existence of .dir-locals.el.
	  (let ((find-file-hook
		 (remq #'tramp-set-connection-local-variables-for-buffer
		       find-file-hook)))
	    (with-current-buffer (find-file-noselect tmp-name2)
	      (should (eq local-variable 'dir))
	      (kill-buffer (current-buffer))))

	  ;; `local-variable' is still connection-local due to Tramp.
	  ;; `find-file-hook' overrides dir-local settings.
	  (write-region
	   "-*- mode: comint; local-variable: file; -*-" nil tmp-name2)
          (should (file-exists-p tmp-name2))
	  (when (memq #'tramp-set-connection-local-variables-for-buffer
		      find-file-hook)
	    (with-current-buffer (find-file-noselect tmp-name2)
	      (should (eq local-variable 'connect))
	      (kill-buffer (current-buffer))))
	  ;; `local-variable' is file-local due to specifying as file variable.
	  (let ((find-file-hook
		 (remq #'tramp-set-connection-local-variables-for-buffer
		       find-file-hook)))
	    (with-current-buffer (find-file-noselect tmp-name2)
	      (should (eq local-variable 'file))
	      (kill-buffer (current-buffer)))))

      ;; Cleanup.
      (custom-set-variables
       `(connection-local-profile-alist ',clpa now)
       `(connection-local-criteria-alist ',clca now))
      (ignore-errors (delete-directory tmp-name1 'recursive)))))

(ert-deftest tramp-test34-explicit-shell-file-name ()
  "Check that connection-local `explicit-shell-file-name' is set."
  :tags '(:expensive-test :tramp-asynchronous-processes)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))

  (let ((default-directory ert-remote-temporary-file-directory)
	explicit-shell-file-name kill-buffer-query-functions
	(clpa connection-local-profile-alist)
	(clca connection-local-criteria-alist))
    (unwind-protect
	(progn
	  (connection-local-set-profile-variables
	   'remote-sh
	   `((explicit-shell-file-name . ,(tramp--test-shell-file-name))
	     (explicit-sh-args
	      . (,(tramp--test-shell-command-switch) "echo foo"))))
	  (connection-local-set-profiles
	   `(:application tramp
	     :protocol ,(file-remote-p default-directory 'method)
	     :user ,(file-remote-p default-directory 'user)
	     :machine ,(file-remote-p default-directory 'host))
	   'remote-sh)
	  (put 'explicit-shell-file-name 'safe-local-variable #'identity)
	  (put 'explicit-sh-args 'safe-local-variable #'identity)

	  ;; Run `shell' interactively.  Since the default directory
	  ;; is remote, `explicit-shell-file-name' shall be set in
	  ;; order to avoid a question.  `explicit-sh-args' echoes the
	  ;; test data.
	  (with-current-buffer (get-buffer-create "*shell*")
	    (ignore-errors (kill-process (get-buffer-process (current-buffer))))
	    (should-not explicit-shell-file-name)
	    (call-interactively #'shell)
	    (with-timeout (10)
	      (while (accept-process-output
		      (get-buffer-process (current-buffer)) nil nil t)))
	    (should (string-match-p (rx bol "foo" eol) (buffer-string)))))

      ;; Cleanup.
      (put 'explicit-shell-file-name 'permanent-local nil)
      (custom-set-variables
       `(connection-local-profile-alist ',clpa now)
       `(connection-local-criteria-alist ',clca now))
      (kill-buffer "*shell*"))))

(ert-deftest tramp-test35-exec-path ()
  "Check `exec-path' and `executable-find'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))
  (skip-unless (tramp--test-supports-set-file-modes-p))

  (let ((tmp-name (tramp--test-make-temp-name))
	(default-directory ert-remote-temporary-file-directory))
    (unwind-protect
	(progn
	  (should (consp (exec-path)))
	  ;; Last element is the `exec-directory'.
	  (should
	   (string-equal
	    (car (last (exec-path)))
	    (file-remote-p default-directory 'localname)))
	  ;; The shell "sh" shall always exist.
	  (should (executable-find "sh" 'remote))
	  ;; Since the last element in `exec-path' is the current
	  ;; directory, an executable file in that directory will be
	  ;; found.
	  (write-region "foo" nil tmp-name)
	  (should (file-exists-p tmp-name))

	  (set-file-modes tmp-name #o777)
	  (should (file-executable-p tmp-name))
	  (should
	   (string-equal
	    (executable-find (file-name-nondirectory tmp-name) 'remote)
	    (file-remote-p tmp-name 'localname)))
	  (should-not
	   (executable-find
	    (concat (file-name-nondirectory tmp-name) "foo") 'remote)))

      ;; Cleanup.
      (ignore-errors (delete-file tmp-name)))))

(tramp--test-deftest-direct-async-process tramp-test35-exec-path)

;; This test is inspired by Bug#33781.
(ert-deftest tramp-test35-remote-path ()
  "Check loooong `tramp-remote-path'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-crypt-p)))

  (let* ((tmp-name (tramp--test-make-temp-name))
	 (default-directory ert-remote-temporary-file-directory)
         (orig-exec-path (exec-path))
         (tramp-remote-path tramp-remote-path)
	 (orig-tramp-remote-path tramp-remote-path)
	 path)
    ;; The "flatpak" method modifies `tramp-remote-path'.
    (skip-unless (not (tramp-compat-connection-local-p tramp-remote-path)))
    (unwind-protect
	(progn
          ;; Non existing directories are removed.
          (setq tramp-remote-path
                (cons (file-remote-p tmp-name 'localname) tramp-remote-path))
          (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
          (should (equal (exec-path) orig-exec-path))
          (setq tramp-remote-path orig-tramp-remote-path)

          ;; Double entries are removed.
          (setq tramp-remote-path (append '("/" "/") tramp-remote-path))
          (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
          (should (equal (exec-path) (cons "/" orig-exec-path)))
          (setq tramp-remote-path orig-tramp-remote-path)

          ;; We make a super long `tramp-remote-path'.
	  (unless (tramp--test-container-oob-p)
            (make-directory tmp-name)
            (should (file-directory-p tmp-name))
            (while (tramp-compat-length< (string-join orig-exec-path ":") 5000)
              (let ((dir (make-temp-file
			  (file-name-as-directory tmp-name) 'dir)))
		(should (file-directory-p dir))
		(setq tramp-remote-path
                      (append
		       tramp-remote-path `(,(file-remote-p dir 'localname)))
                      orig-exec-path
                      (append
		       (butlast orig-exec-path)
		       `(,(file-remote-p dir 'localname))
		       (last orig-exec-path)))))
            (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
            (should (equal (exec-path) orig-exec-path))
	    ;; Ignore trailing newline.
	    (setq path (substring (shell-command-to-string "echo $PATH") nil -1))
	    ;; The shell doesn't handle such long strings.
	    (unless (tramp-compat-length>
		     path
		     (tramp-get-connection-property
		      tramp-test-vec "pipe-buf" 4096))
	      ;; The last element of `exec-path' is `exec-directory'.
              (should
	       (string-equal path (string-join (butlast orig-exec-path) ":"))))
	    ;; The shell "sh" shall always exist.
	    (should (executable-find "sh" 'remote))))

      ;; Cleanup.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
      (setq tramp-remote-path orig-tramp-remote-path)
      (ignore-errors (delete-directory tmp-name 'recursive)))))

(tramp--test-deftest-direct-async-process tramp-test35-remote-path)

(ert-deftest tramp-test36-vc-registered ()
  "Check `vc-registered'."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-crypt-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    ;; We must use `file-truename' for the temporary directory, in
    ;; order to establish the connection prior running an asynchronous
    ;; process.
    (let* ((default-directory
	     (file-truename ert-remote-temporary-file-directory))
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (expand-file-name "foo" tmp-name1))
	   (tramp-remote-process-environment tramp-remote-process-environment)
           (inhibit-message t)
	   (vc-handled-backends
	    (cond
	     ((tramp-find-executable
	       tramp-test-vec vc-git-program
	       (tramp-get-remote-path tramp-test-vec))
	      '(Git))
	     ((tramp-find-executable
	       tramp-test-vec vc-hg-program
	       (tramp-get-remote-path tramp-test-vec))
	      '(Hg))
	     ((tramp-find-executable
	       tramp-test-vec vc-bzr-program
	       (tramp-get-remote-path tramp-test-vec))
	      (setq tramp-remote-process-environment
		    (cons (format "BZR_HOME=%s"
				  (file-remote-p tmp-name1 'localname))
			  tramp-remote-process-environment))
	      ;; We must force a reconnect, in order to activate $BZR_HOME.
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      '(Bzr))
	     (t nil)))
	   ;; Suppress nasty messages.
	   (inhibit-message t))
      (skip-unless vc-handled-backends)
      (unless quoted (tramp--test-message "%s" vc-handled-backends))

      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (write-region "foo" nil tmp-name2)
	    (should (file-directory-p tmp-name1))
	    (should (file-exists-p tmp-name2))
	    (should-not (vc-registered tmp-name1))
	    (should-not (vc-registered tmp-name2))

	    (let ((default-directory tmp-name1))
	      ;; Create empty repository, and register the file.
	      ;; Sometimes, creation of repository fails (bzr!); we
	      ;; skip the test then.
	      (condition-case nil
		  (vc-create-repo (car vc-handled-backends))
		(error (ert-skip "`vc-create-repo' not supported")))
	      ;; The structure of VC-FILESET is not documented.  Let's
	      ;; hope it won't change.
	      (vc-register
	       (list (car vc-handled-backends)
		     (list (file-name-nondirectory tmp-name2))))
	      ;; vc-git uses an own process sentinel, Tramp's sentinel
	      ;; for flushing the cache isn't used.
	      (dired-uncache (concat (file-remote-p default-directory) "/"))
	      (should (vc-registered (file-name-nondirectory tmp-name2)))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name1 'recursive))))))

(ert-deftest tramp-test37-make-auto-save-file-name ()
  "Check `make-auto-save-file-name'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  tramp-allow-unsafe-temporary-files)

      (unwind-protect
	  (progn
	    ;; Use default `auto-save-file-name-transforms' mechanism.
	    ;; It isn't prepared for `separate' syntax.
	    (unless (eq tramp-syntax 'separate)
	      (let (tramp-auto-save-directory)
		(with-temp-buffer
		  (setq buffer-file-name tmp-name1)
		  (should
		   (string-equal
		    (make-auto-save-file-name)
		    ;; This is taken from original `make-auto-save-file-name'.
		    ;; We call `convert-standard-filename', because on
		    ;; MS Windows the (local) colons must be replaced by
		    ;; exclamation marks.
		    (convert-standard-filename
		     (expand-file-name
		      (format
		       "#%s#"
		       (subst-char-in-string
			?/ ?! (replace-regexp-in-string "!" "!!" tmp-name1)))
		      temporary-file-directory)))))))

	    ;; No mapping.
	    (let (tramp-auto-save-directory auto-save-file-name-transforms)
	      (with-temp-buffer
		(setq buffer-file-name tmp-name1)
		(should
		 (string-equal
		  (make-auto-save-file-name)
		  (funcall
		   (if quoted #'file-name-quote #'identity)
		   (expand-file-name
		    (format "#%s#" (file-name-nondirectory tmp-name1))
		    ert-remote-temporary-file-directory))))))

	    ;; Use default `tramp-auto-save-directory' mechanism.
	    ;; Ange-FTP doesn't care.
	    (unless (tramp--test-ange-ftp-p)
	      (let ((tramp-auto-save-directory tmp-name2))
		(with-temp-buffer
		  (setq buffer-file-name tmp-name1)
		  (should
		   (string-equal
		    (make-auto-save-file-name)
		    ;; This is taken from Tramp.
		    (expand-file-name
		     (format
		      "#%s#"
		      (tramp-subst-strs-in-string
		       '(("_" . "|")
			 ("/" . "_a")
			 (":" . "_b")
			 ("|" . "__")
			 ("[" . "_l")
			 ("]" . "_r"))
		       (file-name-unquote tmp-name1)))
		     tmp-name2)))
		  (should (file-directory-p tmp-name2)))))

	    ;; Relative file names shall work, too.  Ange-FTP doesn't care.
	    (unless (tramp--test-ange-ftp-p)
	      (let ((tramp-auto-save-directory "."))
		(with-temp-buffer
		  (setq buffer-file-name tmp-name1
			default-directory tmp-name2)
		  (should
		   (string-equal
		    (make-auto-save-file-name)
		    ;; This is taken from Tramp.
		    (expand-file-name
		     (format
		      "#%s#"
		      (tramp-subst-strs-in-string
		       '(("_" . "|")
			 ("/" . "_a")
			 (":" . "_b")
			 ("|" . "__")
			 ("[" . "_l")
			 ("]" . "_r"))
		       (file-name-unquote tmp-name1)))
		     tmp-name2)))
		  (should (file-directory-p tmp-name2)))))

	    ;; Create temporary file.  This shall check for sensible
	    ;; files, owned by root.
	    (let ((tramp-auto-save-directory temporary-file-directory))
	      (write-region "foo" nil tmp-name1)
	      (when (zerop (or (file-attribute-user-id
				(file-attributes tmp-name1))
			       tramp-unknown-id-integer))
		(with-temp-buffer
		  (setq buffer-file-name tmp-name1)
		  (tramp-cleanup-connection
		   tramp-test-vec 'keep-debug 'keep-password)
		  (let ((tramp-allow-unsafe-temporary-files t))
		    (should (stringp (make-auto-save-file-name))))
		  (tramp-cleanup-connection
		   tramp-test-vec 'keep-debug 'keep-password)
		  (cl-letf (((symbol-function #'yes-or-no-p) #'ignore))
		    (should-error
		     (make-auto-save-file-name)
		     :type 'file-error))
		  (tramp-cleanup-connection
		   tramp-test-vec 'keep-debug 'keep-password)
		  (cl-letf (((symbol-function #'yes-or-no-p)
			     #'tramp-compat-always))
		    (should (stringp (make-auto-save-file-name))))))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(ignore-errors (delete-directory tmp-name2 'recursive))
	(tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)))))

(ert-deftest tramp-test38-find-backup-file-name ()
  "Check `find-backup-file-name'."
  (skip-unless (tramp--test-enabled))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (ange-ftp-make-backup-files t)
	  tramp-allow-unsafe-temporary-files
	  ;; These settings are not used by Tramp, so we ignore them.
	  version-control delete-old-versions
	  (kept-old-versions (default-toplevel-value 'kept-old-versions))
	  (kept-new-versions (default-toplevel-value 'kept-new-versions)))

      (unwind-protect
	  ;; Use default `backup-directory-alist' mechanism.
	  (let (backup-directory-alist tramp-backup-directory-alist)
	    (should
	     (equal
	      (find-backup-file-name tmp-name1)
	      (list
	       (funcall
		(if quoted #'file-name-quote #'identity)
		(expand-file-name
		 (format "%s~" (file-name-nondirectory tmp-name1))
		 ert-remote-temporary-file-directory))))))

	;; Cleanup.  Nothing to do yet.
	nil)

      (unwind-protect
	  ;; Map `backup-directory-alist'.
	  (let ((backup-directory-alist `(("." . ,tmp-name2)))
		tramp-backup-directory-alist)
	    (should
	     (equal
	      (find-backup-file-name tmp-name1)
	      (list
	       (funcall
		(if quoted #'file-name-quote #'identity)
		(expand-file-name
		 (format
		  "%s~"
		  ;; This is taken from `make-backup-file-name-1'.  We
		  ;; call `convert-standard-filename', because on MS
		  ;; Windows the (local) colons must be replaced by
		  ;; exclamation marks.
		  (subst-char-in-string
		   ?/ ?!
		   (replace-regexp-in-string
		    "!" "!!" (convert-standard-filename tmp-name1))))
		 tmp-name2)))))
	    ;; The backup directory is created.
	    (should (file-directory-p tmp-name2)))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name2 'recursive)))

      (unwind-protect
	  ;; Map `tramp-backup-directory-alist'.  Ange-FTP doesn't care.
	  (unless (tramp--test-ange-ftp-p)
	    (let ((tramp-backup-directory-alist `(("." . ,tmp-name2)))
		  backup-directory-alist)
	      (should
	       (equal
		(find-backup-file-name tmp-name1)
		(list
		 (funcall
		  (if quoted #'file-name-quote #'identity)
		  (expand-file-name
		   (format
		    "%s~"
		    ;; This is taken from `make-backup-file-name-1'.
		    ;; We call `convert-standard-filename', because on
		    ;; MS Windows the (local) colons must be replaced
		    ;; by exclamation marks.
		    (subst-char-in-string
		     ?/ ?!
		     (replace-regexp-in-string
		      "!" "!!" (convert-standard-filename tmp-name1))))
		   tmp-name2)))))
	      ;; The backup directory is created.
	      (should (file-directory-p tmp-name2))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name2 'recursive)))

      (unwind-protect
	  ;; Map `tramp-backup-directory-alist' with local file name.
	  ;; Ange-FTP doesn't care.
	  (unless (tramp--test-ange-ftp-p)
	    (let ((tramp-backup-directory-alist
		   `(("." . ,(file-remote-p tmp-name2 'localname))))
		  backup-directory-alist)
	      (should
	       (equal
		(find-backup-file-name tmp-name1)
		(list
		 (funcall
		  (if quoted #'file-name-quote #'identity)
		  (expand-file-name
		   (format
		    "%s~"
		    ;; This is taken from `make-backup-file-name-1'.
		    ;; We call `convert-standard-filename', because on
		    ;; MS Windows the (local) colons must be replaced
		    ;; by exclamation marks.
		    (subst-char-in-string
		     ?/ ?!
		     (replace-regexp-in-string
		      "!" "!!" (convert-standard-filename tmp-name1))))
		   tmp-name2)))))
	      ;; The backup directory is created.
	      (should (file-directory-p tmp-name2))))

	;; Cleanup.
	(ignore-errors (delete-directory tmp-name2 'recursive)))

      (unwind-protect
	  ;; Create temporary file.  This shall check for sensible
	  ;; files, owned by root.
	  (let ((backup-directory-alist `(("." . ,temporary-file-directory)))
		tramp-backup-directory-alist)
	    (write-region "foo" nil tmp-name1)
	    (when (zerop (or (file-attribute-user-id (file-attributes tmp-name1))
			     tramp-unknown-id-integer))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (let ((tramp-allow-unsafe-temporary-files t))
		(should (stringp (car (find-backup-file-name tmp-name1)))))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (cl-letf (((symbol-function #'yes-or-no-p) #'ignore))
		(should-error
		 (find-backup-file-name tmp-name1)
		 :type 'file-error))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (cl-letf (((symbol-function #'yes-or-no-p) #'tramp-compat-always))
		(should (stringp (car (find-backup-file-name tmp-name1)))))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)))))

;; The functions were introduced in Emacs 28.1.
(ert-deftest tramp-test39-make-lock-file-name ()
  "Check `make-lock-file-name', `lock-file', `unlock-file' and `file-locked-p'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))
  ;; Since Emacs 28.1.
  (skip-unless (and (fboundp 'lock-file) (fboundp 'unlock-file)))
  (skip-unless (and (fboundp 'file-locked-p) (fboundp 'make-lock-file-name)))

  ;; `lock-file', `unlock-file', `file-locked-p' and
  ;; `make-lock-file-name' exist since Emacs 28.1.  We don't want to
  ;; see compiler warnings for older Emacsen.
  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
	  (tmp-name2 (tramp--test-make-temp-name nil quoted))
	  (remote-file-name-inhibit-cache t)
	  (remote-file-name-inhibit-locks nil)
	  (create-lockfiles t)
	  tramp-allow-unsafe-temporary-files
          (inhibit-message t)
	  ;; tramp-rclone.el and tramp-sshfs.el cache the mounted files.
	  (tramp-fuse-unmount-on-cleanup t)
          auto-save-default
	  noninteractive)

      (unwind-protect
	  (progn
	    ;; A simple file lock.
	    (should-not (with-no-warnings (file-locked-p tmp-name1)))
	    (with-no-warnings (lock-file tmp-name1))
	    (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))

	    ;; If it is locked already, nothing changes.
	    (with-no-warnings (lock-file tmp-name1))
	    (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))

            ;; `save-buffer' removes the lock.
            (with-temp-buffer
              (set-visited-file-name tmp-name1)
              (insert "foo")
	      (should (buffer-modified-p))
              (save-buffer)
	      (should-not (buffer-modified-p)))
            (should-not (with-no-warnings (file-locked-p tmp-name1)))

            ;; `kill-buffer' removes the lock.
	    (with-no-warnings (lock-file tmp-name1))
	    (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))
            (with-temp-buffer
              (set-visited-file-name tmp-name1)
              (insert "foo")
	      (should (buffer-modified-p))
	      (cl-letf (((symbol-function #'read-from-minibuffer)
                         (lambda (&rest _args) "yes")))
                (kill-buffer)))
	    (should-not (with-no-warnings (file-locked-p tmp-name1)))

            ;; `kill-buffer' should not remove the lock when the
            ;; connection is broken.  See Bug#61663.
	    (with-no-warnings (lock-file tmp-name1))
	    (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))
            (with-temp-buffer
              (set-visited-file-name tmp-name1)
              (insert "foo")
	      (should (buffer-modified-p))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (cl-letf (((symbol-function #'read-from-minibuffer)
                         (lambda (&rest _args) "yes")))
                (kill-buffer)))
	    ;; A new connection changes process id, and also the
	    ;; lock file contents.  But it still exists.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (should (stringp (with-no-warnings (file-locked-p tmp-name1))))

	    ;; When `remote-file-name-inhibit-locks' is set, nothing happens.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (let ((remote-file-name-inhibit-locks t))
	      (with-no-warnings (lock-file tmp-name1))
	      (should-not (with-no-warnings (file-locked-p tmp-name1))))

	    ;; When `lock-file-name-transforms' is set, another lock
	    ;; file is used.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (let ((lock-file-name-transforms `((,(rx (* nonl)) ,tmp-name2))))
	      (should
	       (string-equal
		(with-no-warnings (make-lock-file-name tmp-name1))
		(with-no-warnings (make-lock-file-name tmp-name2))))
	      (with-no-warnings (lock-file tmp-name1))
	      (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))
	      (with-no-warnings (unlock-file tmp-name1))
	      (should-not (with-no-warnings (file-locked-p tmp-name1))))

	    ;; Steal the file lock.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (cl-letf (((symbol-function #'read-char) (lambda (&rest _args) ?s)))
	      (with-no-warnings (lock-file tmp-name1)))
	    (should (eq (with-no-warnings (file-locked-p tmp-name1)) t))

	    ;; Ignore the file lock.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (cl-letf (((symbol-function #'read-char) (lambda (&rest _args) ?p)))
	      (with-no-warnings (lock-file tmp-name1)))
	    (should (stringp (with-no-warnings (file-locked-p tmp-name1))))

	    ;; Quit the file lock machinery.
	    (tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)
	    (cl-letf (((symbol-function #'read-char) (lambda (&rest _args) ?q)))
	      (with-no-warnings
		(should-error
		 (lock-file tmp-name1)
		 :type 'file-locked))
	      ;; The same for `write-region'.
	      (should-error
	       (write-region "foo" nil tmp-name1)
	       :type 'file-locked)
	      (should-error
	       (write-region "foo" nil tmp-name1 nil nil tmp-name1)
               :type 'file-locked)
	      ;; The same for `set-visited-file-name'.
              (with-temp-buffer
	        (should-error
                 (set-visited-file-name tmp-name1)
		 :type 'file-locked)))
	    (should (stringp (with-no-warnings (file-locked-p tmp-name1)))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(with-no-warnings (unlock-file tmp-name1))
	(with-no-warnings (unlock-file tmp-name2))
	(should-not (with-no-warnings (file-locked-p tmp-name1)))
	(should-not (with-no-warnings (file-locked-p tmp-name2))))

      (unwind-protect
	  ;; Create temporary file.  This shall check for sensible
	  ;; files, owned by root.
	  (let ((lock-file-name-transforms auto-save-file-name-transforms))
	    (write-region "foo" nil tmp-name1)
	    (when (zerop (or (file-attribute-user-id (file-attributes tmp-name1))
			     tramp-unknown-id-integer))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (cl-letf (((symbol-function #'yes-or-no-p) #'ignore))
		(should-error
		 (write-region "foo" nil tmp-name1)
		 :type 'file-error))
	      (tramp-cleanup-connection
	       tramp-test-vec 'keep-debug 'keep-password)
	      (cl-letf (((symbol-function #'yes-or-no-p) #'tramp-compat-always))
		(write-region "foo" nil tmp-name1))))

	;; Cleanup.
	(ignore-errors (delete-file tmp-name1))
	(tramp-cleanup-connection tramp-test-vec 'keep-debug 'keep-password)))))

;; The functions were introduced in Emacs 28.1.
(ert-deftest tramp-test39-detect-external-change ()
  "Check that an external file modification is reported."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))
  ;; Since Emacs 28.1.
  (skip-unless (and (fboundp 'lock-file) (fboundp 'file-locked-p)))

  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    (dolist (create-lockfiles '(nil t))
      (let ((tmp-name (tramp--test-make-temp-name nil quoted))
	    (remote-file-name-inhibit-cache t)
	    (remote-file-name-inhibit-locks nil)
	    tramp-allow-unsafe-temporary-files
            (inhibit-message t)
	    ;; tramp-rclone.el and tramp-sshfs.el cache the mounted files.
	    (tramp-fuse-unmount-on-cleanup t)
            auto-save-default
	    (backup-inhibited t)
	    noninteractive)
        (with-temp-buffer
          (unwind-protect
	      (progn
		(setq buffer-file-name tmp-name
		      buffer-file-truename tmp-name)
		(insert "foo")
		;; Bug#53207: with `create-lockfiles' nil, saving the
		;; buffer results in a prompt.
		(cl-letf (((symbol-function #'read-from-minibuffer)
			   (lambda (&rest _)
			     (ert-fail "Test failed unexpectedly"))))
		  (should (buffer-modified-p))
		  (save-buffer)
		  (should-not (buffer-modified-p)))
		(should-not (file-locked-p tmp-name))

		;; For local files, just changing the file
		;; modification on disk doesn't hurt, because file
		;; contents in buffer and on disk are equal.  For
		;; remote files, file contents is not compared.  We
		;; mock an older modification time in buffer, because
		;; Tramp regards modification times equal if they
		;; differ for less than 2 seconds.
		(set-visited-file-modtime (time-add (current-time) -60))
		;; Some Tramp methods cannot check the file
		;; modification time properly, for them it doesn't
		;; make sense to test.
		(when (not (verify-visited-file-modtime))
		  (cl-letf (((symbol-function #'read-char-choice)
			     (lambda (prompt &rest _) (message "%s" prompt) ?y)))
		    (ert-with-message-capture captured-messages
		      (insert "bar")
		      (when create-lockfiles
			(should (string-match-p
				 (rx-to-string
				  `(: bol
				      ,(if (tramp--test-crypt-p)
					   '(+ nonl)
					 (file-name-nondirectory tmp-name))
				      " changed on disk; really edit the buffer?"))
				 captured-messages))
			(should (file-locked-p tmp-name)))))

		  ;; `save-buffer' removes the file lock.
		  (cl-letf (((symbol-function #'yes-or-no-p)
			     #'tramp-compat-always)
			    ((symbol-function #'read-char-choice)
			     (lambda (&rest _) ?y)))
		    (should (buffer-modified-p))
		    (save-buffer)
		    (should-not (buffer-modified-p)))
		  (should-not (file-locked-p tmp-name))))

	    ;; Cleanup.
	    (set-buffer-modified-p nil)
	    (ignore-errors (delete-file tmp-name))
	    (tramp-cleanup-connection
	     tramp-test-vec 'keep-debug 'keep-password)))))))

(ert-deftest tramp-test40-make-nearby-temp-file ()
  "Check `make-nearby-temp-file' and `temporary-file-directory'."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (tramp--test-ange-ftp-p)))

  (let ((default-directory ert-remote-temporary-file-directory)
	tmp-file)
    ;; The remote host shall know a temporary file directory.
    (should (stringp (temporary-file-directory)))
    (should
     (string-equal
      (file-remote-p default-directory)
      (file-remote-p (temporary-file-directory))))

    ;; The temporary file shall be located on the remote host.
    (setq tmp-file (make-nearby-temp-file "tramp-test"))
    (should (file-exists-p tmp-file))
    (should (file-regular-p tmp-file))
    (should
     (string-equal
      (file-remote-p default-directory)
      (file-remote-p tmp-file)))
    (delete-file tmp-file)
    (should-not (file-exists-p tmp-file))

    (setq tmp-file (make-nearby-temp-file "tramp-test" 'dir))
    (should (file-exists-p tmp-file))
    (should (file-directory-p tmp-file))
    (delete-directory tmp-file)
    (should-not (file-exists-p tmp-file))))

(defun tramp--test-emacs28-p ()
  "Check for Emacs version >= 28.1.
Some semantics has been changed for there, without new functions
or variables, so we check the Emacs version directly."
  (>= emacs-major-version 28))

(defun tramp--test-emacs29-p ()
  "Check for Emacs version >= 29.1.
Some semantics has been changed for there, without new functions
or variables, so we check the Emacs version directly."
  (>= emacs-major-version 29))

(defun tramp--test-adb-p ()
  "Check, whether the remote host runs Android.
This requires restrictions of file name syntax."
  (tramp-adb-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-ange-ftp-p ()
  "Check, whether Ange-FTP is used."
  (eq
   (tramp-find-foreign-file-name-handler tramp-test-vec)
   'tramp-ftp-file-name-handler))

(defun tramp--test-asynchronous-processes-p ()
  "Whether asynchronous processes tests are run.
This is used in tests which we don't want to tag
`:tramp-asynchronous-processes' completely."
  (and
   (ert-select-tests
    (ert--stats-selector ert--current-run-stats)
    (list (make-ert-test :name (ert-test-name (ert-running-test))
                         :body nil :tags '(:tramp-asynchronous-processes))))
   ;; tramp-adb.el cannot apply multibyte commands.
   (not (and (tramp--test-adb-p)
	     (string-match-p (rx multibyte) default-directory)))))

(defun tramp--test-box-p ()
  "Check, whether the toolbox or distrobox method is used.
This does not support `tramp-test45-asynchronous-requests'."
  (string-match-p
   (rx bol (| "toolbox" "distrobox") eol)
   (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-container-p ()
  "Check, whether a container method is used.
This does not support some special file names."
  (string-match-p
   (rx bol (| "docker" "podman" "kubernetes" "apptainer" "run0" "nspawn"))
   (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-container-oob-p ()
  "Check, whether the dockercp or podmancp method is used.
They does not support wildcard copy."
  (string-match-p
   (rx bol (| "dockercp" "podmancp") eol)
   (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-crypt-p ()
  "Check, whether the remote directory is encrypted."
  (tramp-crypt-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-expensive-test-p ()
  "Whether expensive tests are run.
This is used in tests which we don't want to tag `:expensive'
completely."
  (ert-select-tests
   (ert--stats-selector ert--current-run-stats)
   (list (make-ert-test :name (ert-test-name (ert-running-test))
                        :body nil :tags '(:expensive-test)))))

(defun tramp--test-ftp-p ()
  "Check, whether an FTP-like method is used.
This does not support globbing characters in file names (yet)."
  ;; Globbing characters are ??, ?* and ?\[.
  (string-suffix-p
   "ftp" (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-fuse-p ()
  "Check, whether an FUSE file system isused."
  (or (tramp--test-rclone-p) (tramp--test-sshfs-p)))

(defun tramp--test-gdrive-p ()
  "Check, whether the gdrive method is used."
  (string-equal
   "gdrive" (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-gvfs-p (&optional method)
  "Check, whether the remote host runs a GVFS based method.
This requires restrictions of file name syntax.
If optional METHOD is given, it is checked first."
  (or (member method tramp-gvfs-methods)
      (tramp-gvfs-file-name-p ert-remote-temporary-file-directory)))

(defun tramp--test-hpux-p ()
  "Check, whether the remote host runs HP-UX.
Several special characters do not work properly there."
  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (ignore-errors (tramp-check-remote-uname tramp-test-vec (rx bol "HP-UX"))))

(defun tramp--test-ksh-p ()
  "Check, whether the remote shell is ksh.
ksh93 makes some strange conversions of non-latin characters into
a $'' syntax."
  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (string-suffix-p
   "ksh"
   (tramp-get-connection-property tramp-test-vec "remote-shell" "")))

(defun tramp--test-macos-p ()
  "Check, whether the remote host runs macOS."
  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (ignore-errors (tramp-check-remote-uname tramp-test-vec "Darwin")))

(defun tramp--test-mock-p ()
  "Check, whether the mock method is used.
This does not support external Emacs calls."
  (string-equal
   "mock" (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-netbsd-p ()
  "Check, whether the remote host runs NetBSD."
  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (ignore-errors (tramp-check-remote-uname tramp-test-vec "NetBSD")))

(defun tramp--test-openbsd-p ()
  "Check, whether the remote host runs OpenBSD."
  ;; We must refill the cache.  `file-truename' does it.
  (file-truename ert-remote-temporary-file-directory)
  (ignore-errors (tramp-check-remote-uname tramp-test-vec "OpenBSD")))

(defun tramp--test-out-of-band-p ()
  "Check, whether an out-of-band method is used."
  (tramp-method-out-of-band-p tramp-test-vec 1))

(defun tramp--test-putty-p ()
  "Check, whether the method method usaes PuTTY.
This does not support connection share for more than two connections."
  (member
   (file-remote-p ert-remote-temporary-file-directory 'method)
   '("plink" "plinkx" "pscp" "psftp")))

(defun tramp--test-rclone-p ()
  "Check, whether the remote host is offered by rclone.
This requires restrictions of file name syntax."
  (tramp-rclone-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-rsync-p ()
  "Check, whether the rsync method is used.
This does not support special file names."
  (string-equal
   "rsync" (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-sh-p ()
  "Check, whether the remote host runs a based method from tramp-sh.el."
  (tramp-sh-file-name-handler-p tramp-test-vec))

(defun tramp--test-sh-no-ls--dired-p ()
  "Check, whether the remote host runs a based method from tramp-sh.el.
Additionally, ls does not support \"--dired\"."
  (and (tramp--test-sh-p)
       (with-temp-buffer
	 ;; We must refill the cache.  `insert-directory' does it.
	 ;; This fails for tramp-crypt.el, so we ignore that.
	 (ignore-errors
	   (insert-directory ert-remote-temporary-file-directory "-al"))
	 (not (tramp-get-connection-property tramp-test-vec "ls--dired")))))

(defun tramp--test-share-p ()
  "Check, whether the method needs a share."
  (and (tramp--test-gvfs-p)
       (string-match-p
	(rx bol (| "afp" (: "dav" (? "s")) "smb") eol)
	(file-remote-p ert-remote-temporary-file-directory 'method))))

(defun tramp--test-sshfs-p ()
  "Check, whether the remote host is offered by sshfs.
This requires restrictions of file name syntax."
  (tramp-sshfs-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-sudoedit-p ()
  "Check, whether the sudoedit method is used."
  (tramp-sudoedit-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-telnet-p ()
  "Check, whether the telnet method is used.
This does not support special file names."
  (string-equal
   "telnet" (file-remote-p ert-remote-temporary-file-directory 'method)))

(defun tramp--test-windows-nt-p ()
  "Check, whether the locale host runs MS Windows."
  (eq system-type 'windows-nt))

(defun tramp--test-windows-nt-and-out-of-band-p ()
  "Check, whether the locale host runs MS Windows and an out-of-band method.
This does not support utf8 based file transfer."
  (and (tramp--test-windows-nt-p)
       (tramp--test-out-of-band-p)))

(defun tramp--test-windows-nt-or-smb-p ()
  "Check, whether the locale or remote host runs MS Windows.
This requires restrictions of file name syntax."
  (or (tramp--test-windows-nt-p)
      (tramp--test-smb-p)))

(defun tramp--test-smb-p ()
  "Check, whether the locale or remote host runs MS Windows.
This requires restrictions of file name syntax."
  (tramp-smb-file-name-p ert-remote-temporary-file-directory))

(defun tramp--test-supports-processes-p ()
  "Return whether the method under test supports external processes."
  (unless (tramp--test-crypt-p)
    ;; We use it to enable/disable tests in a given test run, for
    ;; example for remote processes on MS Windows.
    (if (tramp-connection-property-p
         tramp-test-vec "tramp--test-supports-processes-p")
	(tramp-get-connection-property
	 tramp-test-vec "tramp--test-supports-processes-p")
      (or (tramp--test-adb-p) (tramp--test-sh-p) (tramp--test-sshfs-p)))))

(defun tramp--test-supports-set-file-modes-p ()
  "Return whether the method under test supports setting file modes."
  ;; "smb" does not unless the SMB server supports "posix" extensions.
  ;; "adb" does not unless the Android device is rooted.
  (or (tramp--test-sh-p) (tramp--test-sshfs-p) (tramp--test-sudoedit-p)
      ;; Not all tramp-gvfs.el methods support changing the file mode.
      (and
       (tramp--test-gvfs-p)
       (string-suffix-p
	"ftp" (file-remote-p ert-remote-temporary-file-directory 'method)))))

(defun tramp--test-check-files (&rest files)
  "Run a simple but comprehensive test over every file in FILES."
  (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
    ;; We must use `file-truename' for the temporary directory,
    ;; because it could be located on a symlinked directory.  This
    ;; would let the test fail.
    (let* ((ert-remote-temporary-file-directory
	    (file-truename ert-remote-temporary-file-directory))
	   (tramp-fuse-remove-hidden-files t)
	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
	   (tmp-name2 (tramp--test-make-temp-name 'local quoted))
	   (files
            (tramp-compat-seq-keep
	     (lambda (x) (unless (string-empty-p x) x)) files))
	   (process-environment process-environment)
	   (sorted-files (sort (copy-sequence files) #'string-lessp))
	   buffer)
      (unwind-protect
	  (progn
	    (make-directory tmp-name1)
	    (make-directory tmp-name2)

	    (dolist (elt files)
              ;(tramp--test-message "'%s'" elt)
	      (let* ((file1 (expand-file-name elt tmp-name1))
		     (file2 (expand-file-name elt tmp-name2))
		     (file3 (expand-file-name (concat elt "foo") tmp-name1)))
		(write-region elt nil file1)
		(should (file-exists-p file1))

		;; Check file contents.
		(with-temp-buffer
		  (insert-file-contents file1)
		  (should (string-equal (buffer-string) elt)))

		;; Copy file both directions.
		(copy-file file1 (file-name-as-directory tmp-name2))
		(should (file-exists-p file2))
		(delete-file file1)
		(should-not (file-exists-p file1))
		(copy-file file2 (file-name-as-directory tmp-name1))
		(should (file-exists-p file1))

		(tramp--test-ignore-make-symbolic-link-error
		  (make-symbolic-link file1 file3)
		  (should (file-symlink-p file3))
		  (should
		   (string-equal
		    (expand-file-name file1) (file-truename file3)))
		  (should
		   (string-equal
		    (funcall
		     (if quoted #'file-name-quote #'identity)
		     (file-attribute-type (file-attributes file3)))
		    (file-remote-p (file-truename file1) 'localname)))
		  ;; Check file contents.
		  (with-temp-buffer
		    (insert-file-contents file3)
		    (should (string-equal (buffer-string) elt)))
		  (delete-file file3))))

	    ;; Check file names.
	    (should (equal (directory-files
			    tmp-name1 nil directory-files-no-dot-files-regexp)
			   sorted-files))
	    (should (equal (directory-files
			    tmp-name2 nil directory-files-no-dot-files-regexp)
			   sorted-files))
	    (should (equal (mapcar
			    #'car
			    (directory-files-and-attributes
			     tmp-name1 nil directory-files-no-dot-files-regexp))
			   sorted-files))
	    (should (equal (mapcar
			    #'car
			    (directory-files-and-attributes
			     tmp-name2 nil directory-files-no-dot-files-regexp))
			   sorted-files))

	    ;; Check, that `insert-directory' works properly.
	    (with-current-buffer
		(setq buffer (dired-noselect tmp-name1 "--dired -al"))
	      (goto-char (point-min))
	      (while (not (eobp))
		(when-let ((name (dired-get-filename 'no-dir 'no-error)))
		  (unless
		      (string-match-p name directory-files-no-dot-files-regexp)
		    (should (member name files))))
		(forward-line 1)))
	    (kill-buffer buffer)

	    ;; `substitute-in-file-name' could return different
	    ;; values.  For "adb", there could be strange file
	    ;; permissions preventing overwriting a file.  We don't
	    ;; care in this test case.
	    (dolist (elt files)
	      (let ((file1
		     (substitute-in-file-name (expand-file-name elt tmp-name1)))
		    (file2
		     (substitute-in-file-name
		      (expand-file-name elt tmp-name2))))
		(ignore-errors (write-region elt nil file1))
		(should (file-exists-p file1))
		(ignore-errors (write-region elt nil file2 nil 'nomessage))
		(should (file-exists-p file2))))

	    (should (equal (directory-files
			    tmp-name1 nil directory-files-no-dot-files-regexp)
			   (directory-files
			    tmp-name2 nil directory-files-no-dot-files-regexp)))

	    ;; Check directory creation.  We use a subdirectory "foo"
	    ;; in order to avoid conflicts with previous file name tests.
	    (dolist (elt files)
	      (let* ((elt1 (concat elt "foo"))
		     (file1 (expand-file-name (concat "foo/" elt) tmp-name1))
		     (file2 (expand-file-name elt file1))
		     (file3 (expand-file-name elt1 file1)))
		(make-directory file1 'parents)
		(should (file-directory-p file1))
		(write-region elt nil file2)
		(should (file-exists-p file2))
		(should
		 (equal
		  (directory-files
		   file1 nil directory-files-no-dot-files-regexp)
		  `(,elt)))
		(should
		 (equal
		  (caar (directory-files-and-attributes
			 file1 nil directory-files-no-dot-files-regexp))
		  elt))

		;; Check symlink in `directory-files-and-attributes'.
		;; It does not work in the "smb" case, only relative
		;; symlinks to existing files are shown there.  On
		;; NetBSD, there are problems with loooong file names,
		;; see Bug#65324.
		(tramp--test-ignore-make-symbolic-link-error
		  (unless (or (tramp--test-netbsd-p) (tramp--test-smb-p))
		    (make-symbolic-link file2 file3)
		    (should (file-symlink-p file3))
		    (should
		     (string-equal
		      (caar (directory-files-and-attributes
			     file1 nil (rx (literal elt1))))
		      elt1))
		    (should
		     (string-equal
		      (funcall
		       (if quoted #'file-name-quote #'identity)
		       (cadr (car (directory-files-and-attributes
				   file1 nil (rx (literal elt1))))))
		      (file-remote-p (file-truename file2) 'localname)))
		    (delete-file file3)
		    (should-not (file-exists-p file3))))

		;; Check, that a process runs on a remote
		;; `default-directory' with special characters.  See
		;; Bug#53846.
		(when (and (tramp--test-expensive-test-p)
			   (tramp--test-supports-processes-p))
		  (let ((default-directory file1))
		    (dolist (this-shell-command
			     (append
			      ;; Synchronously.
			      '(shell-command)
			      ;; Asynchronously.
			      (and (tramp--test-asynchronous-processes-p)
				   '(tramp--test-async-shell-command))))
		      (with-temp-buffer
			(funcall this-shell-command "cat -- *" (current-buffer))
			(should
			 (string-match-p
			  (rx (literal elt) eol) (buffer-string)))))))

		(delete-file file2)
		(should-not (file-exists-p file2))
		(delete-directory file1 'recursive)
		(should-not (file-exists-p file1))))

	    ;; Check, that environment variables are set correctly.
            ;; We do not run on macOS due to encoding problems.  See
            ;; Bug#36940.
	    (when (and (tramp--test-expensive-test-p) (tramp--test-sh-p)
		       (not (tramp--test-crypt-p))
		       (not (eq system-type 'darwin)))
	      (dolist (elt files)
		(let ((envvar (concat "VAR_" (upcase (md5 elt))))
		      (elt (encode-coding-string elt coding-system-for-read))
		      (default-directory ert-remote-temporary-file-directory)
		      (process-environment process-environment))
		  (setenv envvar elt)
		  ;; The value of PS1 could confuse Tramp's detection
		  ;; of process output.  So we unset it temporarily.
		  (setenv "PS1")
		  (with-temp-buffer
		    (when (zerop (process-file "printenv" nil t nil))
		      (goto-char (point-min))
		      (should
		       (search-forward-regexp
			(rx
			 bol (literal envvar)
			 "=" (literal (getenv envvar)) eol)))))))))

	;; Cleanup.
	(ignore-errors (kill-buffer buffer))
	(ignore-errors (delete-directory tmp-name1 'recursive))
	(ignore-errors (delete-directory tmp-name2 'recursive))))))

;; These tests are inspired by Bug#17238.
(ert-deftest tramp-test41-special-characters ()
  "Check special characters in file names."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (getenv "EMACS_HYDRA_CI"))) ; SLOW ~ 245s
  (skip-unless (not (tramp--test-rsync-p)))
  (skip-unless (not (tramp--test-rclone-p)))
  (skip-unless (not (or (eq system-type 'darwin) (tramp--test-macos-p))))

  ;; Newlines, slashes and backslashes in file names are not
  ;; supported.  So we don't test.  And we don't test the tab
  ;; character on Windows or Cygwin, because the backslash is
  ;; interpreted as a path separator, preventing "\t" from being
  ;; expanded to <TAB>.
  (let ((files
	 (list
	  (cond ((or (tramp--test-ange-ftp-p)
		     (tramp--test-container-p)
		     (tramp--test-gvfs-p)
		     (tramp--test-openbsd-p)
		     (tramp--test-rclone-p)
		     (tramp--test-sudoedit-p)
		     (tramp--test-windows-nt-or-smb-p))
		 "foo bar baz")
		((or (tramp--test-adb-p)
		     (eq system-type 'cygwin))
		 " foo bar baz ")
		((tramp--test-sh-no-ls--dired-p)
		 "\tfoo bar baz\t")
		(t " foo\tbar baz\t"))
	  "@foo@bar@baz@"
	  (unless (tramp--test-windows-nt-and-out-of-band-p) "$foo$bar$$baz$")
	  "-foo-bar-baz-"
	  (unless (tramp--test-windows-nt-and-out-of-band-p) "%foo%bar%baz%")
	  "&foo&bar&baz&"
	  (unless (or (tramp--test-ftp-p)
		      (tramp--test-gvfs-p)
		      (tramp--test-windows-nt-or-smb-p))
	    "?foo?bar?baz?")
	  (unless (or (tramp--test-container-oob-p)
		      (tramp--test-ftp-p)
		      (tramp--test-gvfs-p)
		      (tramp--test-windows-nt-or-smb-p))
	    "*foo+bar*baz+")
	  (if (or (tramp--test-gvfs-p) (tramp--test-windows-nt-or-smb-p))
	      "'foo'bar'baz'"
	    "'foo\"bar'baz\"")
	  "#foo~bar#baz~"
	  (unless (tramp--test-windows-nt-and-out-of-band-p)
	    (if (or (tramp--test-gvfs-p) (tramp--test-windows-nt-or-smb-p))
		"!foo!bar!baz!"
	      "!foo|bar!baz|"))
	  (if (or (tramp--test-gvfs-p)
		  (tramp--test-rclone-p)
		  (tramp--test-windows-nt-or-smb-p))
	      ";foo;bar;baz;"
	    ":foo;bar:baz;")
	  (unless (or (tramp--test-gvfs-p) (tramp--test-windows-nt-or-smb-p))
	    "<foo>bar<baz>")
	  "(foo)bar(baz)"
	  (unless (or (tramp--test-container-oob-p)
		      (tramp--test-ftp-p)
		      (tramp--test-gvfs-p))
	    "[foo]bar[baz]")
	  "{foo}bar{baz}")))
    ;; Simplify test in order to speed up.
    (apply #'tramp--test-check-files
	   (if (tramp--test-expensive-test-p)
	       files (list (string-join files ""))))))

(tramp--test-deftest-with-stat tramp-test41-special-characters)

(tramp--test-deftest-with-perl tramp-test41-special-characters)

(tramp--test-deftest-with-ls tramp-test41-special-characters)

(tramp--test-deftest-without-file-attributes tramp-test41-special-characters)

(tramp--test-deftest-direct-async-process tramp-test41-special-characters)

(ert-deftest tramp-test42-utf8 ()
  "Check UTF8 encoding in file names and file contents."
  (skip-unless (tramp--test-enabled))
  (skip-unless (not (getenv "EMACS_HYDRA_CI"))) ; SLOW ~ 620s
  (skip-unless (not (tramp--test-container-p)))
  (skip-unless (not (tramp--test-rsync-p)))
  (skip-unless (not (tramp--test-windows-nt-and-out-of-band-p)))
  (skip-unless (not (tramp--test-ksh-p)))
  (skip-unless (not (tramp--test-gdrive-p)))
  (skip-unless (not (tramp--test-crypt-p)))
  (skip-unless (not (tramp--test-rclone-p)))
  (skip-unless (not (or (eq system-type 'darwin) (tramp--test-macos-p))))

  (let ((coding-system-for-read 'utf-8)
	(coding-system-for-write 'utf-8)
	(file-name-coding-system
	 (coding-system-change-eol-conversion 'utf-8 'unix)))
    (apply
     #'tramp--test-check-files
     (append
      (list
       (unless (tramp--test-hpux-p) "Γυρίστε το Γαλαξία με Ώτο Στοπ")
       (unless (tramp--test-hpux-p)
	 "أصبح بوسعك الآن تنزيل نسخة كاملة من موسوعة ويكيبيديا العربية لتصفحها بلا اتصال بالإنترنت")
       "银河系漫游指南系列"
       "Автостопом по гала́ктике"
       ;; Use codepoints without a name.  See Bug#31272.
       ;; Works on some Android systems only.
       (unless (or (tramp--test-adb-p) (tramp--test-openbsd-p))
	 "bung")
       ;; Use codepoints from Supplementary Multilingual Plane (U+10000
       ;; to U+1FFFF).
       "🌈🍒👋")

      (when (tramp--test-expensive-test-p)
	(delete-dups
	 (mapcar
	  ;; Use all available language specific snippets.
	  (lambda (x)
	    (and
	     ;; The "Oriya" and "Odia" languages use some problematic
	     ;; composition characters.
	     (not (member (car x) '("Oriya" "Odia")))
             (stringp (setq x (eval (get-language-info (car x) 'sample-text) t)))
	     ;; Filter out strings which use unencodable characters.
	     (not (and (or (tramp--test-gvfs-p) (tramp--test-smb-p))
		       (unencodable-char-position
			0 (length x) file-name-coding-system nil x)))
	     ;; Filter out not displayable characters.
	     (setq x (mapconcat
		      (lambda (y)
			(and (char-displayable-p y) (char-to-string y)))
		      x ""))
             (not (string-empty-p x))
	     ;; ?\n and ?/ shouldn't be part of any file name.  ?\t,
	     ;; ?. and ?? do not work for "smb" method.  " " does not
	     ;; work at begin or end of the string for MS Windows.
	     (replace-regexp-in-string (rx (any " \t\n/.?")) "" x)))
	  language-info-alist)))))))

(tramp--test-deftest-with-stat tramp-test42-utf8)

(tramp--test-deftest-with-perl tramp-test42-utf8)

(tramp--test-deftest-with-ls tramp-test42-utf8)

(tramp--test-deftest-without-file-attributes tramp-test42-utf8)

(tramp--test-deftest-direct-async-process tramp-test42-utf8)

(ert-deftest tramp-test43-file-system-info ()
  "Check that `file-system-info' returns proper values."
  (skip-unless (tramp--test-enabled))

  (when-let ((fsi (file-system-info ert-remote-temporary-file-directory)))
    (should (consp fsi))
    (should (tramp-compat-length= fsi 3))
    (dotimes (i (length fsi))
      (should (natnump (or (nth i fsi) 0))))))

;; `file-user-uid' and `file-group-gid' were introduced in Emacs 30.1.
(ert-deftest tramp-test44-file-user-group-ids ()
  "Check results of user/group functions.
`file-user-uid', `file-group-gid', and `tramp-get-remote-*'
should all return proper values."
  (skip-unless (tramp--test-enabled))

  (let ((default-directory ert-remote-temporary-file-directory))
    ;; `file-user-uid' and `file-group-gid' exist since Emacs 30.1.
    ;; We don't want to see compiler warnings for older Emacsen.
    (when (fboundp 'file-user-uid)
      (should (integerp (with-no-warnings (file-user-uid)))))
    (when (fboundp 'file-group-gid)
      (should (integerp (with-no-warnings (file-group-gid)))))

    (with-parsed-tramp-file-name default-directory nil
      (should (or (integerp (tramp-get-remote-uid v 'integer))
		  (null (tramp-get-remote-uid v 'integer))))
      (should (or (stringp (tramp-get-remote-uid v 'string))
		  (null (tramp-get-remote-uid v 'string))))

      (should (or (integerp (tramp-get-remote-gid v 'integer))
		  (null (tramp-get-remote-gid v 'integer))))
      (should (or (stringp (tramp-get-remote-gid v 'string))
		  (null (tramp-get-remote-gid v 'string))))

      (when-let ((groups (tramp-get-remote-groups v 'integer)))
	(should (consp groups))
	(dolist (group groups) (should (integerp group))))
      (when-let ((groups (tramp-get-remote-groups v 'string)))
	(should (consp groups))
	(dolist (group groups) (should (stringp group)))))))

;; `tramp-test45-asynchronous-requests' could be blocked.  So we set a
;; timeout of 300 seconds, and we send a SIGUSR1 signal after 300
;; seconds.  Similar check is performed in the timer function.
(defconst tramp--test-asynchronous-requests-timeout 300
  "Timeout for `tramp-test45-asynchronous-requests'.")

(defmacro tramp--test-with-proper-process-name-and-buffer (proc &rest body)
  "Set \"process-name\" and \"process-buffer\" connection properties.
The values are derived from PROC.  Run BODY.
This is needed in timer functions as well as process filters and sentinels."
  ;; FIXME: For tramp-sshfs.el, `processp' does not work.
  (declare (indent 1) (debug (processp body)))
  `(let* ((v (tramp-get-connection-property ,proc "vector"))
	  (pname (tramp-get-connection-property v "process-name"))
	  (pbuffer (tramp-get-connection-property v "process-buffer")))
     (tramp--test-message
      "tramp--test-with-proper-process-name-and-buffer before %s %s"
      (tramp-get-connection-property v "process-name")
      (tramp-get-connection-property v "process-buffer"))
     (if (process-name ,proc)
	 (tramp-set-connection-property v "process-name" (process-name ,proc))
       (tramp-flush-connection-property v "process-name"))
     (if (process-buffer ,proc)
	 (tramp-set-connection-property
	  v "process-buffer" (process-buffer ,proc))
       (tramp-flush-connection-property v "process-buffer"))
     (tramp--test-message
      "tramp--test-with-proper-process-name-and-buffer changed %s %s"
      (tramp-get-connection-property v "process-name")
      (tramp-get-connection-property v "process-buffer"))
     (unwind-protect
	 (progn ,@body)
       (if pname
	   (tramp-set-connection-property v "process-name" pname)
	 (tramp-flush-connection-property v "process-name"))
       (if pbuffer
	   (tramp-set-connection-property v "process-buffer" pbuffer)
	 (tramp-flush-connection-property v "process-buffer")))))

;; This test is inspired by Bug#16928.
(ert-deftest tramp-test45-asynchronous-requests ()
  "Check parallel asynchronous requests.
Such requests could arrive from timers, process filters and
process sentinels.  They shall not disturb each other."
  :tags '(:expensive-test :tramp-asynchronous-processes)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-supports-processes-p))
  (skip-unless (not (tramp--test-container-p)))
  (skip-unless (not (tramp--test-sshfs-p)))
  (skip-unless (not (tramp--test-telnet-p)))
  (skip-unless (not (tramp--test-box-p)))
  (skip-unless (not (tramp--test-windows-nt-p)))

  (with-timeout
      (tramp--test-asynchronous-requests-timeout (tramp--test-timeout-handler))
    (define-key special-event-map [sigusr1] #'tramp--test-timeout-handler)
    (let* (;; For the watchdog.
	   (default-directory (expand-file-name temporary-file-directory))
	   ;; It doesn't work on w32 systems.
	   (watchdog
            (start-process-shell-command
             "*watchdog*" nil
             (format
	      "sleep %d; kill -USR1 %d"
	      tramp--test-asynchronous-requests-timeout (emacs-pid))))
           (tmp-name (tramp--test-make-temp-name))
           (default-directory tmp-name)
           ;; Do not cache Tramp properties.
           (remote-file-name-inhibit-cache t)
           (process-file-side-effects t)
           ;; Suppress nasty messages.
           (inhibit-message t)
	   ;; Do not run delayed timers.
	   (timer-max-repeats 0)
	   ;; Number of asynchronous processes for test.  Tests on
	   ;; some machines handle less parallel processes.
           (number-proc
            (cond
             ((ignore-errors
               (string-to-number (getenv "REMOTE_PARALLEL_PROCESSES"))))
	     ((getenv "EMACS_HYDRA_CI") 5)
             (t 10)))
	   ;; PuTTY-based methods can only share up to 10 connections.
	   (tramp-use-connection-share
	    (if (and (tramp--test-putty-p) (>= number-proc 10))
		'suppress (bound-and-true-p tramp-use-connection-share)))
           ;; On hydra, timings are bad.
           (timer-repeat
            (cond
             ((getenv "EMACS_HYDRA_CI") 10)
             (t 1)))
	   ;; This is when all timers start.  We check inside the
	   ;; timer function, that we don't exceed timeout.
	   (timer-start (current-time))
           timer buffers kill-buffer-query-functions)

      (unwind-protect
          (progn
            (make-directory tmp-name)

            ;; Setup a timer in order to raise an ordinary command
            ;; again and again.  `vc-registered' is well suited,
            ;; because there are many checks.
            (setq
             timer
             (run-at-time
              0 timer-repeat
              (lambda ()
                (tramp--test-with-proper-process-name-and-buffer
                    (get-buffer-process (tramp-get-buffer tramp-test-vec))
                  (when (> (- (time-to-seconds) (time-to-seconds timer-start))
                           tramp--test-asynchronous-requests-timeout)
                    (tramp--test-timeout-handler))
                  (when buffers
                    (let ((time (float-time))
                          (default-directory tmp-name)
                          (file (buffer-name (seq-random-elt buffers))))
                      (tramp--test-message
                       "Start timer %s %s" file (current-time-string))
		      (dired-uncache file)
		      (tramp--test-message
		       "Continue timer %s %s" file (file-attributes file))
		      (vc-registered file)
                      (tramp--test-message
                       "Stop timer %s %s" file (current-time-string))
                      ;; Adjust timer if it takes too much time.
                      (when (> (- (float-time) time) timer-repeat)
                        (setq timer-repeat (* 1.1 (- (float-time) time)))
                        (setf (timer--repeat-delay timer) timer-repeat)
                        (tramp--test-message
                         "Increase timer %s" timer-repeat))))))))

            ;; Create temporary buffers.  The number of buffers
            ;; corresponds to the number of processes; it could be
            ;; increased in order to make pressure on Tramp.
            (dotimes (_ number-proc)
              (setq buffers (cons (generate-new-buffer "foo") buffers)))

            ;; Open asynchronous processes.  Set process filter and sentinel.
            (dolist (buf buffers)
	      ;; Activate timer.
	      (sit-for 0.01 'nodisp)
              (let ((proc
                     (start-file-process-shell-command
                      (buffer-name buf) buf
                      (concat
		       "(read line && echo $line >$line && echo $line);"
		       "(read line && cat $line);"
		       "(read line && rm -f $line)")))
                    (file (expand-file-name (buffer-name buf))))
                ;; Remember the file name.  Add counter.
                (process-put proc 'foo file)
                (process-put proc 'bar 0)
                ;; Add process filter.
                (set-process-filter
                 proc
                 (lambda (proc string)
		   (tramp--test-with-proper-process-name-and-buffer proc
                     (tramp--test-message
                      "Process filter %s %s %s"
		      proc string (current-time-string))
                     (with-current-buffer (process-buffer proc)
                       (insert string))
                     (when (< (process-get proc 'bar) 2)
		       (dired-uncache (process-get proc 'foo))
                       (should (file-attributes (process-get proc 'foo)))))))
                ;; Add process sentinel.  It shall not perform remote
                ;; operations, triggering Tramp processes.  This blocks.
                (set-process-sentinel
                 proc
                 (lambda (proc _state)
		   (tramp--test-with-proper-process-name-and-buffer proc
                     (tramp--test-message
                      "Process sentinel %s %s" proc (current-time-string)))))
		(tramp--test-message "Process started %s" proc)))

            ;; Send a string to the processes.  Use a random order of
            ;; the buffers.  Mix with regular operation.
            (let ((buffers (copy-sequence buffers))
		  buf)
              (while buffers
		(setq buf (seq-random-elt buffers))
                (if-let ((proc (get-buffer-process buf))
			 (file (process-get proc 'foo))
			 (count (process-get proc 'bar)))
		    (progn
                      (tramp--test-message
                       "Start action %d %s %s" count buf (current-time-string))
                      ;; Regular operation prior process action.
		      (dired-uncache file)
                      (if (= count 0)
			  (should-not (file-attributes file))
			(should (file-attributes file)))
                      ;; Send string to process.
                      (process-send-string
		       proc (format "%s\n" (buffer-name buf)))
                      (while (accept-process-output nil 0))
                      (tramp--test-message
                       "Continue action %d %s %s"
		       count buf (current-time-string))
                      ;; Regular operation post process action.
		      (dired-uncache file)
                      (if (= count 2)
			  (should-not (file-attributes file))
			(should (file-attributes file)))
                      (tramp--test-message
                       "Stop action %d %s %s" count buf (current-time-string))
                      (process-put proc 'bar (1+ count))
                      (unless (process-live-p proc)
			(setq buffers (delq buf buffers))))
		  (setq buffers (delq buf buffers)))))

            ;; Checks.  All process output shall exist in the
            ;; respective buffers.  All created files shall be
            ;; deleted.
            (tramp--test-message "Check %s" (current-time-string))
            (dolist (buf buffers)
              (with-current-buffer buf
                (should
		 (string-equal
		  ;; tramp-adb.el echoes, so we must add the three strings.
		  (if (tramp--test-adb-p)
		      (format "%s\n%s\n%s\n%s\n%s\n" buf buf buf buf buf)
		    (format "%s\n%s\n" buf buf))
		  (buffer-string)))))
            (should-not
             (directory-files
              tmp-name nil directory-files-no-dot-files-regexp)))

        ;; Cleanup.
        (define-key special-event-map [sigusr1] #'ignore)
        (ignore-errors (quit-process watchdog))
        (dolist (buf buffers)
          (ignore-errors (delete-process (get-buffer-process buf)))
          (ignore-errors (kill-buffer buf)))
        (ignore-errors (cancel-timer timer))
        (ignore-errors (delete-directory tmp-name 'recursive))))))

;; (tramp--test-deftest-direct-async-process tramp-test45-asynchronous-requests
;;   'unstable)

(ert-deftest tramp-test46-dired-compress-file ()
  "Check that Tramp (un)compresses normal files."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-crypt-p)))
  ;; Starting with Emacs 29.1, `dired-compress-file' is performed by
  ;; default handler.
  (skip-unless (not (tramp--test-emacs29-p)))

  (let ((default-directory ert-remote-temporary-file-directory)
        (tmp-name (tramp--test-make-temp-name)))
    (write-region "foo" nil tmp-name)
    (dired default-directory)
    (dired-revert)
    (dired-goto-file tmp-name)
    (should-not (dired-compress))
    (should (string= (concat tmp-name ".gz") (dired-get-filename)))
    (should-not (dired-compress))
    (should (string= tmp-name (dired-get-filename)))
    (delete-file tmp-name)))

(ert-deftest tramp-test46-dired-compress-dir ()
  "Check that Tramp (un)compresses directories."
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-sh-p))
  (skip-unless (not (tramp--test-crypt-p)))
  ;; Starting with Emacs 29.1, `dired-compress-file' is performed by
  ;; default handler.
  (skip-unless (not (tramp--test-emacs29-p)))

  (let ((default-directory ert-remote-temporary-file-directory)
        (tmp-name (tramp--test-make-temp-name)))
    (make-directory tmp-name)
    (dired default-directory)
    (dired-revert)
    (dired-goto-file tmp-name)
    (should-not (dired-compress))
    (should (string= (concat tmp-name ".tar.gz") (dired-get-filename)))
    (should-not (dired-compress))
    (should (string= tmp-name (dired-get-filename)))
    (delete-directory tmp-name)
    (delete-file (concat tmp-name ".tar.gz"))))

(ert-deftest tramp-test47-read-password ()
  "Check Tramp password handling."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-enabled))
  (skip-unless (tramp--test-mock-p))
  ;; Not all read commands understand argument "-s" or "-p".
  (skip-unless
   (string-empty-p
    (let ((shell-file-name "sh"))
      (shell-command-to-string "read -s -p Password: pass"))))

  (let ((pass "secret")
	(mock-entry (copy-tree (assoc "mock" tramp-methods)))
	mocked-input tramp-methods)
    ;; We must mock `read-string', in order to avoid interactive
    ;; arguments.
    (cl-letf* (((symbol-function #'read-string)
		(lambda (&rest _args) (pop mocked-input))))
      (setcdr
       (assq 'tramp-login-args mock-entry)
       `((("-c")
	  (,(tramp-shell-quote-argument
	     (concat
	      "read -s -p 'Password: ' pass; echo; "
	      "(test \"pass$pass\" != \"pass" pass "\" && "
	      "echo \"Login incorrect\" || sh -i)"))))))
      (setq tramp-methods `(,mock-entry))

      ;; Reading password from stdin works.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      ;; We don't want to invalidate the password.
      (setq mocked-input `(,(copy-sequence pass)))
      (should (file-exists-p ert-remote-temporary-file-directory))

      ;; Don't entering a password returns in error.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      (setq mocked-input nil)
      (should-error (file-exists-p ert-remote-temporary-file-directory))

      ;; A wrong password doesn't work either.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      (setq mocked-input `(,(concat pass pass)))
      (should-error (file-exists-p ert-remote-temporary-file-directory))

      ;; Reading password from auth-source works.  We use the netrc
      ;; backend; the other backends shall behave similar.
      ;; Macro `ert-with-temp-file' was introduced in Emacs 29.1.
      (with-no-warnings (when (symbol-plist 'ert-with-temp-file)
	(tramp-cleanup-connection tramp-test-vec 'keep-debug)
	(setq mocked-input nil)
	(auth-source-forget-all-cached)
	(ert-with-temp-file netrc-file
	  :prefix "tramp-test" :suffix ""
	  :text (format
		 "machine %s port mock password %s"
		 (file-remote-p ert-remote-temporary-file-directory 'host) pass)
	  (let ((auth-sources `(,netrc-file)))
	    (should (file-exists-p ert-remote-temporary-file-directory)))))))))

(ert-deftest tramp-test47-read-otp-password ()
  "Check Tramp one-time password handling."
  :tags '(:expensive-test)
  (skip-unless (tramp--test-mock-p))
  ;; Not all read commands understand argument "-s" or "-p".
  (skip-unless
   (string-empty-p
    (let ((shell-file-name "sh"))
      (shell-command-to-string "read -s -p Password: pass"))))

  (let ((pass "secret")
	(mock-entry (copy-tree (assoc "mock" tramp-methods)))
	mocked-input tramp-methods)
    ;; We must mock `read-string', in order to avoid interactive
    ;; arguments.
    (cl-letf* (((symbol-function #'read-string)
		(lambda (&rest _args) (pop mocked-input))))
      (setcdr
       (assq 'tramp-login-args mock-entry)
       `((("-c")
	  (,(tramp-shell-quote-argument
	     (concat
	      "read -s -p 'Verification code: ' pass; echo; "
	      "(test \"pass$pass\" != \"pass" pass "\" && "
	      "echo \"Login incorrect\" || sh -i)"))))))
      (setq tramp-methods `(,mock-entry))

      ;; Reading password from stdin works.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      ;; We don't want to invalidate the password.
      (setq mocked-input `(,(copy-sequence pass)))
      (should (file-exists-p ert-remote-temporary-file-directory))

      ;; Don't entering a password returns in error.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      (setq mocked-input nil)
      (should-error (file-exists-p ert-remote-temporary-file-directory))

      ;; A wrong password doesn't work either.
      (tramp-cleanup-connection tramp-test-vec 'keep-debug)
      (setq mocked-input `(,(concat pass pass)))
      (should-error (file-exists-p ert-remote-temporary-file-directory))

      ;; The password shouldn't be read from auth-source.
      ;; Macro `ert-with-temp-file' was introduced in Emacs 29.1.
      (with-no-warnings (when (symbol-plist 'ert-with-temp-file)
	(tramp-cleanup-connection tramp-test-vec 'keep-debug)
	(setq mocked-input nil)
	(auth-source-forget-all-cached)
	(ert-with-temp-file netrc-file
	  :prefix "tramp-test" :suffix ""
	  :text (format
		 "machine %s port mock password %s"
		 (file-remote-p ert-remote-temporary-file-directory 'host)
		 pass)
	  (let ((auth-sources `(,netrc-file)))
	    (should-error
	     (file-exists-p ert-remote-temporary-file-directory)))))))))

;; This test is inspired by Bug#29163.
(ert-deftest tramp-test48-auto-load ()
  "Check that Tramp autoloads properly."
  ;; If we use another syntax but `default', Tramp is already loaded
  ;; due to the `tramp-change-syntax' call.
  (skip-unless (eq tramp-syntax 'default))
  (skip-unless (tramp--test-enabled))

  (let ((default-directory (expand-file-name temporary-file-directory))
	(code
	 (format
	  ;; Suppress method name check.
	  "(let ((non-essential t)) \
             (message \"Tramp loaded: %%s\" (and (file-remote-p %S) t)))"
	  ert-remote-temporary-file-directory)))
    (should
     (string-match-p
      (rx "Tramp loaded: t" (+ (any "\r\n")))
      (shell-command-to-string
       (format
	"%s -batch -Q -L %s --eval %s"
	(shell-quote-argument
	 (expand-file-name invocation-name invocation-directory))
	(mapconcat #'shell-quote-argument load-path " -L ")
	(shell-quote-argument code)))))))

(ert-deftest tramp-test48-delay-load ()
  "Check that Tramp is loaded lazily, only when needed."
  ;; Tramp is neither loaded at Emacs startup, nor when completing a
  ;; non-Tramp file name like "/foo".  Completing a Tramp-alike file
  ;; name like "/foo:" autoloads Tramp, when `tramp-mode' is t.
  (let ((default-directory (expand-file-name temporary-file-directory))
	(code
	 "(progn \
           (setq tramp-mode %s) \
	   (message \"Tramp loaded: %%s\" (featurep 'tramp)) \
	   (file-name-all-completions \"/foo\" \"/\") \
	   (message \"Tramp loaded: %%s\" (featurep 'tramp)) \
	   (file-name-all-completions \"/foo:\" \"/\") \
	   (message \"Tramp loaded: %%s\" (featurep 'tramp)))"))
    ;; Tramp doesn't load when `tramp-mode' is nil.
    (dolist (tm '(t nil))
      (should
       (string-match-p
	(rx
	 "Tramp loaded: nil" (+ (any "\r\n"))
	 "Tramp loaded: nil" (+ (any "\r\n"))
	 "Tramp loaded: " (literal (symbol-name tm)) (+ (any "\r\n")))
	(shell-command-to-string
	 (format
	  "%s -batch -Q -L %s --eval %s"
	  (shell-quote-argument
	   (expand-file-name invocation-name invocation-directory))
	  (mapconcat #'shell-quote-argument load-path " -L ")
	  (shell-quote-argument (format code tm)))))))))

(ert-deftest tramp-test48-recursive-load ()
  "Check that Tramp does not fail due to recursive load."
  (skip-unless (tramp--test-enabled))

  (let ((default-directory (expand-file-name temporary-file-directory)))
    (dolist (code
	     (list
	      (format
	       "(expand-file-name %S)" ert-remote-temporary-file-directory)
	      (format
	       "(let ((default-directory %S)) (expand-file-name %S))"
	       ert-remote-temporary-file-directory
	       temporary-file-directory)))
      (should-not
       (string-match-p
	"Recursive load"
	(shell-command-to-string
	 (format
	  "%s -batch -Q -L %s --eval %s"
	  (shell-quote-argument
	   (expand-file-name invocation-name invocation-directory))
	  (mapconcat #'shell-quote-argument load-path " -L ")
	  (shell-quote-argument code))))))))

(ert-deftest tramp-test48-remote-load-path ()
  "Check that Tramp autoloads its packages with remote `load-path'."
  ;; `tramp-cleanup-all-connections' is autoloaded from tramp-cmds.el.
  ;; It shall still work, when a remote file name is in the
  ;; `load-path'.
  (let ((default-directory (expand-file-name temporary-file-directory))
	(code
	 "(let ((force-load-messages t) \
		(load-path (cons \"/foo:bar:\" load-path))) \
	    (tramp-cleanup-all-connections))"))
    (should
     (string-match-p
      (rx
       "Loading "
       (literal
        (expand-file-name
         "tramp-cmds" (file-name-directory (locate-library "tramp")))))
      (shell-command-to-string
       (format
	"%s -batch -Q -L %s -l tramp-sh --eval %s"
	(shell-quote-argument
	 (expand-file-name invocation-name invocation-directory))
	(mapconcat #'shell-quote-argument load-path " -L ")
	(shell-quote-argument code)))))))

(ert-deftest tramp-test49-without-remote-files ()
  "Check that Tramp can be suppressed."
  (skip-unless (tramp--test-enabled))

  (should (file-remote-p ert-remote-temporary-file-directory))
  (should-not
   (without-remote-files (file-remote-p ert-remote-temporary-file-directory)))
  (should (file-remote-p ert-remote-temporary-file-directory))

  (inhibit-remote-files)
  (should-not (file-remote-p ert-remote-temporary-file-directory))
  (tramp-register-file-name-handlers)
  (setq tramp-mode t)
  (should (file-remote-p ert-remote-temporary-file-directory)))

(ert-deftest tramp-test50-unload ()
  "Check that Tramp and its subpackages unload completely.
Since it unloads Tramp, it shall be the last test to run."
  :tags '(:expensive-test)
  ;; We have autoloaded objects from tramp.el and tramp-archive.el.
  ;; In order to remove them, we first need to load both packages.
  (require 'tramp)
  (require 'tramp-archive)
  (should (featurep 'tramp))
  (should (featurep 'tramp-archive))
  ;; This unloads also tramp-archive.el and tramp-theme.el if needed.
  (unload-feature 'tramp 'force)

  ;; No Tramp feature must be left except the test packages.
  (should-not (featurep 'tramp))
  (should-not (featurep 'tramp-archive))
  (should-not (featurep 'tramp-theme))
  (should-not
   (all-completions
    "tramp" (delq 'tramp-tests (delq 'tramp-archive-tests features))))

  ;; `file-name-handler-alist' must be clean.
  (should-not (all-completions "tramp" (mapcar #'cdr file-name-handler-alist)))

  ;; There shouldn't be left a bound symbol, except buffer-local
  ;; variables, and autoloaded functions.  We do not regard our test
  ;; symbols, and the Tramp unload hooks.
  (mapatoms
   (lambda (x)
     (and (or (and (boundp x) (null (local-variable-if-set-p x)))
	      (and (functionp x) (null (autoloadp (symbol-function x))))
	      (macrop x))
	  (string-prefix-p "tramp" (symbol-name x))
	  (string-match-p (rx bol "with" (| "tramp" "parsed")) (symbol-name x))
	  ;; `tramp-completion-mode' is autoloaded in Emacs < 28.1.
	  (not (eq 'tramp-completion-mode x))
	  ;; `tramp-register-archive-file-name-handler' is autoloaded
	  ;; in Emacs < 29.1.
	  (not (eq 'tramp-register-archive-file-name-handler x))
	  ;; `tramp-compat-rx' is autoloaded in Emacs 29.1.
	  (not (eq 'tramp-compat-rx x))
	  (not (string-match-p
		(rx bol "tramp" (? "-archive") (** 1 2 "-") "test")
		(symbol-name x)))
	  (not (string-suffix-p "unload-hook" (symbol-name x)))
	  (not (get x 'tramp-autoload))
	  (ert-fail (format "`%s' still bound" x)))))

  ;; The defstruct `tramp-file-name' and all its internal functions
  ;; shall be purged.
  (should-not (cl--find-class 'tramp-file-name))
  (mapatoms
   (lambda (x)
     (and (functionp x) (null (autoloadp (symbol-function x)))
          (string-prefix-p "tramp-file-name" (symbol-name x))
          (ert-fail (format "Structure function `%s' still exists" x)))))

  ;; There shouldn't be left a hook function containing a Tramp
  ;; function.  We do not regard the Tramp unload hooks.
  (mapatoms
   (lambda (x)
     (and (boundp x)
	  (string-match-p
	   (rx "-" (| "hook" "function") (? "s") eol) (symbol-name x))
	  (not (string-suffix-p "unload-hook" (symbol-name x)))
	  (consp (symbol-value x))
	  (ignore-errors (all-completions "tramp" (symbol-value x)))
	  (ert-fail (format "Hook `%s' still contains Tramp function" x)))))

  ;; There shouldn't be left an advice function from Tramp.
  (mapatoms
   (lambda (x)
     (and (functionp x)
	  (advice-mapc
	   (lambda (fun _symbol)
	     (and (string-prefix-p "tramp" (symbol-name fun))
		  (ert-fail
		   (format "Function `%s' still contains Tramp advice" x))))
	   x))))

  ;; Reload.
  (require 'tramp)
  (require 'tramp-archive)
  (should (featurep 'tramp))
  (should (featurep 'tramp-archive)))

(defun tramp-test-all (&optional interactive)
  "Run all tests for \\[tramp].
If INTERACTIVE is non-nil, the tests are run interactively."
  (interactive "p")
  (funcall
   (if interactive #'ert-run-tests-interactively #'ert-run-tests-batch)
   (rx bol "tramp")))

;; TODO:

;; * dired-uncache (partly done in other test functions)
;; * file-equal-p (partly done in `tramp-test21-file-links')
;; * file-in-directory-p
;; * file-name-case-insensitive-p
;; * memory-info
;; * tramp-get-home-directory
;; * tramp-set-file-uid-gid

;; * Work on skipped tests.  Make a comment, when it is impossible.
;; * Use `skip-when' starting with Emacs 30.1.
;; * Revisit expensive tests, once problems in `tramp-error' are solved.
;; * Fix `tramp-test06-directory-file-name' for "ftp".
;; * Check, why a process filter t doesn't work in
;;   `tramp-test29-start-file-process' and
;;   `tramp-test30-make-process'.
;; * Implement `tramp-test31-interrupt-process' and
;;   `tramp-test31-signal-process' for "adb", "sshfs" and for direct
;;   async processes.  Check, why they don't run stable.
;; * Check, why `tramp-test45-asynchronous-requests' often fails.  The
;;   famous reentrant error?
;; * Check, why direct async processes do not work for
;;   `tramp-test45-asynchronous-requests'.

(provide 'tramp-tests)

;;; tramp-tests.el ends here
